I'm doing a shell-off restoration on a 1950
Flying Cloud #7002.
The pipe frame has been beefed-up with additional steel and now it's ready for a new sub-floor.
Oddly, the aluminum cross-members that are still connected to the pipe as they originally were are not all in the same plane. There is 1/2" or more variation in height from one to the next in spots.
Additionally, there is no support on the tail end and the subfloor would have to sag a good 1/2" or more from the last cross-member in the rear until it rests on the pipe in the center.
It seems the subfloor would quite uneven if I simply attach the wood to the aluminum cross-members as they are. My thought is to rip shims of pressure-treated 2x material to caulk into place and then screw through them.
These could correct all of the cross-members that are too low. Also these shims could provide extra support if used between the steel pipe or frame and the subfloor in various spots where additional support could be helpful.
Has anyone got any experience with this issue or suggestions for me?