I don't believe in the utility of sinks, either, except for storing crap while traveling.
I also don't use water tanks in trailers or motorhomes.
But I do like a warm shower. The on-demand external water does sound nice.
Clearance from mattress to over-foot storage seems pretty good. A lot of people tend to set that far too tight in the beginning.
Have you mocked up the measurements and tested it?
Aside from foot room, I lay out my designs in painter's tape every time I change something. Twice, I've done full size cardboard mockups.
It really helps get a better feel for what the dimensions actually mean. --Especially in my case, since I'm doing several things quite a bit differently than the norm.
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Swoody, I generally agree.
A rolled front does look better for a bare TD.
But most modern builds seem to be putting tongue boxes up there. In that case, the rolled front doesn't always look better.
The squared front also offers just a bit more storage, and/or room for electrical and batteries, if they're going up front. The interior and exterior roof panels should be easier to install, as well.
I went for something different, though. I settled on a 'swept' front for my design. (Hopefully finally getting cut and welded late winter / early spring, after the current project leaves the garage - A) because it has to haul the materials; B) because it is in the way.)
My design has the TD profile up top, but transitions into a straight (but not vertical), then a bit of a curve into a rearward sweeping angle. It has been seen in other designs, but I don't know what else to call it.
The decision was made for many reasons. But the primary factors were: I will have boot storage up front, but it doesn't have to be flat. I want the primary fuse panel to be in the front left corner, but I will not have batteries inside. I will have a battery (or two) and, possibly, a 20 lb propane tank on the tongue; but I will not be adding a tongue box. I want a lot of storage in the head board (floor to ceiling), but the lower section doesn't need a flat bottom.
And I will probably be putting some kind of rock guard on the lower 12-18" of the front, since my build is a "rough road" TD. It will spend most of its time in use on rough, rocky trails, or back country gravel roads; and flat surfaces are much easier to put rock guards on.
I don't seem to have plans on this laptop any more. So here's a quick MS Paint sketch.
(Not entirely representative of anything except the basic idea of the lower front profile.)

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