The riveted extrusions use the rivets for a mechanical structural connection between the extrusion components only, there is a bead of Sika laid in between but when the 2 aluminum components are riveted together in a zero clearance fashion, the Sika becomes a sealant more so than an adhesive. The extrusions are bonded to the floor with no mechanical fasteners.
The walls have the same finish inside, it's decent, I'm making some changes to a different premium finish skin as a standard material.
The walls have 2 runs installed during assembly and I have a really cool drill "bit" that lets me bore a straight hole if I need to install more runs, I an go 5' at a time, and just press pvc conduit in. The assembly sequence is key to making it all work. On my F-650 all of the wiring is surface mount, all of the wood trim is routed out on the back side, and other ideas like that to conceal it, you cannot see a wire anywhere, and you can get at every inch of plumbing and electrical with relative ease. I'm leaning towards that method too, see what it all looks like when we start putting it together.
I do like a lot of the features and designs in the Euro market, and I like a lot of the designs of the American market. There are some shortfalls to both and we will never have everything we want but I'm trying!
Cheers,
Mark.