It could be done as a design meant to be flat-packed and shipped, a la various products from places like IKEA. But the weight would make it costly. The shipping costs would easily exceed the material costs. And eats up much room for profit for the builder. I'd happily help design something for you, I've always got plenty of ideas. The trick is making it fit well without access to the vehicle. Parts could be made with a 'trim to fit' excess, but if the end-customer has the skill and basic hand tools to do that, they already have what they need to make the thing in the first place.
It could be built as a 'flat pack' design using the same sort of 'barrel nut' hardware used by IKEA and other flat-pack office furniture brands.
And done in 1/2" plywood / birch equivalent. And with your pattern of drawers there could be vertical dividers which would make the top deck more than sturdy enough to serve as a bench or sleeping platform, using all 1/2" material. Then the question is securing it to the vehicle. In my own design I used existing tie-down bolt locations and removable seat attachment brackets. How do I do that remotely?
I could get close enough in the overall design if you were to trace a floor pattern using some craft paper or leftover roll ow wrapping paper. Lay out your centerline - or whatever line you want your drawer faces on - tape one edge of the paper to that, then flatten out the paper to the sidewall of the space, working it into the edge where floor meets vertical surface and putting pen or marker to that line. The just fold up that pattern and mail it to me, and take a bunch of photographs of the interior location in the vehicle from a bunch of angles I'd ask for, so I can ensure a closer fitment. Then I could build the box / platform / drawers in a manner that could be broken down flat again. And take a series of assembly instruction sequence photographs. I've done it before on other projects. It's a lot of work but it isn't technically difficult. My last such effort was a pair of redwood picnic tables that folded up into benches, which I shipped to Texas.
Not the first time I've done such a thing.
There's a link in my sig for a bunch of other woodworking stuff I've done, besides my several 'building stuff from scratch' topics around here.
I can build what you want. Question is will it seem like an affordable value to you? My labor rates are cheap, I'm semi-retired and like working with wood. But like I've said, by the time it adds up you might think it's too costly. And there are certainly some better full-time cabinetry craftsman who have shown their work here who might do a better job for you. Albeit a more expensive one.
I'm willing to do the work if you want to try it. We can work some arrangement out. I'll sketch up a couple design ideas tonight. And my 'building' time is booked up for the next several weeks, I've got some more tiling work out of town and a neighbor's bathroom remodel to do. But can be available to build this for you around the end of May. ish. Won't take long once it actually begins.
So think about what you want it to look like, what sort of surface finishes you want it to have, what sort of functionality you want out of it. Figure out the total height and width.
I'm already picturing a series of drawers, a box body that is like a series of cubbyholes, a deck that is hinged in two halves, so you can access the drawer contents from above, if the floor is full of gear and the drawers can't be opened, and putting the drawers on runners you could even have a pull out table at the rear, similar to my own design. It would be nestled under the drawers and the drawer dividers would bridge over the pull-out.