Haven't gotten the pictures taken of the Glen-L plan set yet, but I am still working on this
So far, located some potential holding tanks, still undecided on if I want to go with the original holding tank design (Combined, large single tank), or take a page from the blog entry on Glen-L from the fella that built one of these and uses two twin 20 gallon tanks side by side.
I located where the blogger got his, Ameri-Kart - Holding Tanks
. He used two of the H189Bs, side by side on the over hang.
I've also located a potential source for the shower pan for the wet bath (The original is too far gone to reuse, plus its the wrong size) Factory RV Surplus
So far, I'm debating taking a page from the looks of the old Amerigo's and using a combination of Filon and the original siding, depending on the price of Filon sheets to cut costs, unless I can find smooth aluminum sheets for a better price.
Either way, my walls will be a sandwich design, with plywood on the inside surface and a layer of luan board on the outside of the frame (since filon will require the luan anyway), to make a nice durable truss.
The rear bed is still up in the air, I've been causally searching to see if I can find someone parting out an Amerigo, so I can simply steal the whole rear bed assembly, but I haven't found one within a reasonable distance.
To those that commented about structural weakening that would be created by cutting a giant whole in the rear wall, let me restate that my plan was never to have a large opening, rather a small door opening to facilitate entry and exit into the bed space, with the rest of the wall still solid around it, the rear bed basically being almost it's own little room.