Most van conversions begin with a floor, but at Overland Van Creations, the floor is much more than something to walk on. It is the structural foundation around which the rest of the interior is designed.
We call that foundation DATUM.
In engineering and manufacturing, a datum is a known reference used to locate, measure, and align other features. That is exactly what the DATUM system does inside an OVC van. It establishes a controlled reference plane, creates mechanically meaningful attachment locations for the major assemblies, and coordinates much of the work that must happen beneath the finished floor.
The idea can be summarized in one sentence:
The van anchors DATUM, and DATUM anchors the modules.
CAPTURING THE VEHICLE
The interior of a cargo van is not a clean, square box. The floor contains ridges, valleys, seams, slopes, factory fasteners, and penetrations. Wheel wells interrupt the usable space, the walls curve inward, and the vehicle’s existing attachment points are rarely positioned where a cabinet builder would ideally want them.
OVC begins by capturing that irregular geometry with a three-dimensional, submillimeter scanning process incorporating photogrammetry. Instead of relying entirely on tape measures and individually recorded dimensions, the scanner produces a dense digital representation of the vehicle’s interior surfaces.
That scan records the contours of the floor, wheel wells, door openings, structural ribs, wall curves, factory penetrations, and potential attachment sites. Of particular importance are the factory D-ring connection points and other locations that may provide suitable connections between DATUM and the vehicle.
The raw scan is not yet a buildable floor. It is a map of ridges, curves, openings, and physical reference points. That information must be interpreted and converted into usable CAD geometry.
Within the digital model, the irregular surfaces of the van are translated into defined planes, profiles, boundaries, and attachment coordinates. The finished floor plane is established, the wheel wells and thresholds are located, and the positions of the approved vehicle connections are mapped. These measurements and reference points are then used to calculate the complete geometry of the DATUM floor.
The result is a floor system designed around the actual van—not merely around the published dimensions of that model.
A STRUCTURAL FOUNDATION
At the heart of DATUM is a mechanically connected framework of aluminum extrusion installed beneath the finished walking surface. Primary structural members run longitudinally through the vehicle and connect the interior structure to carefully selected vehicle attachment points.
The framework establishes the floor geometry while also providing the foundation for the Structural Interface Rails, or SIRs. These rails create known, dependable attachment locations for the bed, galley, storage, water system, and other purpose-built modules.
This is an important distinction. A cabinet should not simply be screwed into plywood and trusted to remain in place while the vehicle travels over rough roads or makes an emergency stop. Every substantial interior assembly needs a deliberate load path connecting it to the vehicle.
The SIRs provide that load path. They are mechanically connected directly to DATUM’s underlying aluminum structure rather than relying on the plywood floor surface for their strength. The modules can then be secured to the SIRs at designed attachment points, allowing their loads to pass through the rails, into the DATUM framework, and ultimately into the vehicle.
DATUM therefore serves two related purposes: it creates the structural foundation beneath the floor, and it establishes the attachment geometry above it.
A DELIBERATE THERMAL COMPROMISE
Metal conducts heat far more readily than insulation, so any aluminum member that passes through an insulated floor creates some degree of thermal bridging. OVC is not ignoring that reality, nor is DATUM being presented as a perfectly uninterrupted thermal envelope.
The SIRs create intentional, localized thermal bridges because they must connect mechanically to the aluminum structure beneath the floor. Separating them with a soft insulating layer might improve thermal performance, but it would also weaken the direct structural relationship that makes them useful.
OVC is making a deliberate engineering tradeoff: accepting limited thermal bridging in exchange for strong, predictable, mechanically meaningful equipment attachment points.
The objective is not to eliminate every thermal bridge regardless of consequence. It is to control where those bridges occur, minimize them where practical, and retain them where structural performance requires direct material continuity. Insulation fills the remaining spaces within the DATUM framework, limiting heat transfer across most of the floor area while the aluminum structure and SIRs provide the strength needed to secure the conversion.
For OVC, that is the better balance. Thermal efficiency matters, but the interior must also remain securely attached to the vehicle.
PROTECTED UTILITIES
The depth of the DATUM framework also provides planned space for insulation and selected utility routes. Electrical wiring and water lines can be coordinated in CAD before construction begins instead of being threaded through whatever spaces remain after the cabinetry has been installed.
That planning matters because concealed utilities require protection. Wiring must be kept away from abrasion, sharp edges, and excessive heat. Water lines need appropriate support and protection from pinching or movement. Electrical and plumbing routes should also be separated where practical and directed efficiently toward the systems they serve.
Before the floor is closed, all concealed work is inspected, tested, photographed, and documented. Wiring can be checked for continuity, plumbing can be pressure-tested, and every route can be recorded in the vehicle’s as-built documentation. Once the completed floor is installed, these areas are no longer readily accessible, making careful planning and verification before closure essential.
MARINE-GRADE FINISHES
The aluminum framework, insulation, and protected utilities are covered by a marine-grade plywood subfloor. Marine plywood is selected for its consistent construction and resistance to moisture-related deterioration—important qualities in a vehicle exposed to changing temperatures, condensation, wet equipment, plumbing, and life outdoors.
The plywood is then covered with marine-grade linoleum to create the finished walking surface. Marine linoleum provides a durable, cleanable finish suited to the demands of an adventure vehicle. Together, these layers create a stable floor surface while the structural aluminum beneath them carries the important attachment loads.
DATUM is installed before the finished CANVAS wall and ceiling panels. This allows the floor geometry and structural connections to be established first, giving every later component a dependable reference.
To the customer, the completed result may simply look like a clean, durable floor. The most important work is hidden underneath: the scan-derived geometry, vehicle connections, aluminum framework, SIR attachment points, insulation, protected utilities, marine plywood, and documentation that organize the entire conversion.
That is the purpose of DATUM. It transforms the irregular shell of a cargo van into a measured, coordinated, and mechanically meaningful foundation—one designed to support everything that follows.