Wheel well is located close to the shower pan. Both locations are finalized and the shower pan is checked to fit and be supported by the cross members.
To keep water from damaging our new floor, the plywood is sealed or waterproofed. Colin uses Smiths CPES Penetrating Epoxy 2 part epoxy. The underside is soaked and the upper side is sealed at the outer edges of each board.
The C-Channel will hold the wall and provides the stability and contact between the wall and the wood floor and chassis below.
The curved C-Channel for the front and rear corners was made in 1955 by Airstream in small segments. Colin fabricated new C-Channels from 032 aka 50/50 aluminum "belly pan" aluminum.
Then the C-Channel is positioned on the floor, checking the fit again.