Modified 5x10 Benroy

Based off a combination of AlgoDan's design and Alaska Teardrop's construction techniques. (with under-storage)
I really liked AlgoDan's flat back setup. I also like a lot of _Ryan_'s interior and cabinet layout.
Side Profile View

Side Framing View

Top Framing View

Rear View

Notes:
Using a 5'x10 utility trailer frame w/ 15" wheels on 2000-3000 lb axle
Was thinking of making this using 1"x1"x18 gauge box steel frame (maybe using 16ga tubing for lower area since it'll be taking the weight). mainly to save on weight and for added strength. (also trying to find someone who might fabricate the frame from Aluminum box as well)
Exterior skinned with 1/2" ply w/ aluminum. (trying to find a source for 70" aluminum is hard. Might have to go with 60" and cover the lower section separately.)
Interior skinned with 1/4" ply.
Lower storage will house a 20ga water tank (situated over axle) and 1-2 AGM batteries.
Lower storage will have big full extension slide drawers at rear for kitchen storage. (We cook for larger groups so having extra space for stuff would be nice)
Lower storage will have side to side storage at front for things like popup canopy and chairs.
and some side hatch doors for "misc"
Roof will carry 1-2 Solar panels to feed AGM.
Target weight 1000-1200lbs dry. (prolly won't hit that but it's good to have a target)
So what am I missing?
I really liked AlgoDan's flat back setup. I also like a lot of _Ryan_'s interior and cabinet layout.
Side Profile View

Side Framing View

Top Framing View

Rear View

Notes:
Using a 5'x10 utility trailer frame w/ 15" wheels on 2000-3000 lb axle
Was thinking of making this using 1"x1"x18 gauge box steel frame (maybe using 16ga tubing for lower area since it'll be taking the weight). mainly to save on weight and for added strength. (also trying to find someone who might fabricate the frame from Aluminum box as well)
Exterior skinned with 1/2" ply w/ aluminum. (trying to find a source for 70" aluminum is hard. Might have to go with 60" and cover the lower section separately.)
Interior skinned with 1/4" ply.
Lower storage will house a 20ga water tank (situated over axle) and 1-2 AGM batteries.
Lower storage will have big full extension slide drawers at rear for kitchen storage. (We cook for larger groups so having extra space for stuff would be nice)
Lower storage will have side to side storage at front for things like popup canopy and chairs.
and some side hatch doors for "misc"
Roof will carry 1-2 Solar panels to feed AGM.
Target weight 1000-1200lbs dry. (prolly won't hit that but it's good to have a target)
So what am I missing?