Thanks Reboot11133 - I understand where you're coming from. I originally wanted to have a bit more of a rounded nose on this one but never came up with a way to do so without either losing the strength and using multiple plys of very thin material or shaping some dimensional lumber in a laminate (sort of what you see for the columns at the home supply stores) and losing the insulation space. After some cad renditions I decided on this boxier shape and am really pleased with the result!
As far as weight goes, she's a big girl. My estimate during the build based on material takeoffs was a tad over 2,200lb and it turned out close - around 2,100lb loaded with gear. The strength definitely cost weight but I'm happy with the trade-off. My Tacoma tows it without issue and the 3,500lb axle is overkill but were worth it for the brakes alone.
To do it again I'd strongly consider building the frame of identical design but from aluminum stem to stern. I also would consider going to all 2"x2" construction and lose the 2"x4"s. Perhaps shed a bit more with slightly thinner plywood. To be honest, I would almost consider doing the above with 5'x10' sheets and gain an overall larger space for close to the same finished curb weight.
Maybe the next one??