Camper box for cab over truck

Hello everyone,
I am in the process of importing a small cab over truck (Nissan Atlas ~5x10ft bed) and am planning on building a small camper box for it with a bed, basic electronics and basic sink (think of the van conversions with two jugs and a foot pump).
Wanted some opinions on the construction and design. The max payload of the truck is 1500kg so should have lots of room to work with! Here are my plans so far:
Base:
2x4 pressure treated with 1/2" ply and a barrier. 12" on center.
Walls:
2x2s with a 2x4 on each corner 16" on center skinned with 1/4" ply inside and out
Roof:
Undecided on a flat roof or if I should frame the walls with a slight angle towards the rear. A slight curve might also work? Maybe 3/4" ply cut with a nice curve.
Framing:
For assembling the framing I have seen MANY different ways people have put it together. Pocket holes, toe nail, L brackets all sorts. I was thinking a screw into each stud from the opposing side with some glue would suffice.
Exterior
For finishing the outside I was thinking of doing pmf then fully priming and painting the box inside and out before the insulation and interior skin goes on.
Attached is a quick sketchup drawing of the wall and floor framing. Final dimensions, windows and doors still need to be sorted out.
Little bit of a disorganized post but hopefully everyone understands what I mean!
Thanks
Hmm seems the sketchup drawing doesnt want to attach Here is an image instead.
I am in the process of importing a small cab over truck (Nissan Atlas ~5x10ft bed) and am planning on building a small camper box for it with a bed, basic electronics and basic sink (think of the van conversions with two jugs and a foot pump).
Wanted some opinions on the construction and design. The max payload of the truck is 1500kg so should have lots of room to work with! Here are my plans so far:
Base:
2x4 pressure treated with 1/2" ply and a barrier. 12" on center.
Walls:
2x2s with a 2x4 on each corner 16" on center skinned with 1/4" ply inside and out
Roof:
Undecided on a flat roof or if I should frame the walls with a slight angle towards the rear. A slight curve might also work? Maybe 3/4" ply cut with a nice curve.
Framing:
For assembling the framing I have seen MANY different ways people have put it together. Pocket holes, toe nail, L brackets all sorts. I was thinking a screw into each stud from the opposing side with some glue would suffice.
Exterior
For finishing the outside I was thinking of doing pmf then fully priming and painting the box inside and out before the insulation and interior skin goes on.
Attached is a quick sketchup drawing of the wall and floor framing. Final dimensions, windows and doors still need to be sorted out.
Little bit of a disorganized post but hopefully everyone understands what I mean!
Thanks
Hmm seems the sketchup drawing doesnt want to attach Here is an image instead.