My no-name trailer build has begun, with the assembly of the Northern Tool 5x8 aluminum non-folding trailer.
The deck is going to 5/8" plywood directly on trailer beams, no frame.
The walls and galley bulkhead are insulation panels with 1/4" doug fir ACX to create a type of structural insulation panel (I know they aren't true SIPs, but I don't know what else to call them. Non-structural insulation panels. Yeah, NSIPs.) A local buddy has a 5'x10' vacuum bagging setup and is helping me. I joined the local SynShop to gain access to their carpentry tools, including a 4x8 CNC router.
I've done some design using onshape (free in-browser CAD software), you can look at the panels I made here:
https://cad.onshape.com/documents/6ec1f ... ac616a5dfc
The construction method will be slot and tab, with 1" tabs screwed to the deck with a corresponding slot in the NSIP to fit over, glued and screwed. The galley walls and counter will connect to each other and to the walls the same way.
I think that will be the most interesting part of this build. Lots of new skills for me to learn including: CAD software, CNC router, vacuum bagging, electrical system design.
I'm homeless (by choice) but also couch surf w friends and family when I'm not out exploring the southwest US. Thanks for the ongoing help and sharing of experience to everyone here.