Ok I pulled the trigger and brought home a harbor freight 4' x 8' trailer. I have 3 custom size windows ordered. I have also been collecting bits a parts for the build.
I plan to follow the plans pretty closely for layout B, the one with the double bed in the back and a table/bed in the front. it a few ideas for how to make the table change to a bed and some storage ideas. I will try to keep a build journal here.