by noseoil » Thu Apr 26, 2018 8:00 am
3/4" plywood for walls is ok if it's thoroughly skeletonized. You will need a light, strong framework to be under the 1,000# rolling weight you need. That's the frame & panels you need to build with & a skeletonized floor system as well.
3/4" ply for cabinets is way overkill, 1/2" with thinner face frames (1/2" solid) or no face frames at all is better. Use the side-walls of the build for your outside cabinet panels. Just make sure you have a web at each fastening point (lights, hinges, panels, bulkheads, cabinets, etc.)
.040" aluminum is ok for durability, just remember it's about .57# per square foot, or on a 5X8 build it will add about 75# with moldings & fasteners.
A good foam mattress will be about 50# so think weight here also. It's something you need to be comfortable, so choose wisely.
My build was too heavy once I added so much "extra" stuff to it (solar, group 27 battery, 110v, stereo & speakers, TV, sound bar, bluray player....) The frame was over 500#, so that was bad to begin with, but it's still solid as the day it was built. 5X9X4' tall @ 1660#... Just sayin' be careful!