Class C overhead movement causing seal failure

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Haven't made very much progress in the 7 months since I bought this MH.
My son (who's doing the rebuild) has been busy rebuilding a number of other RVs. We managed to salvage the front wall after we removed the rotted wood that was in it. The piece is just hanging there, secured across the top. We will have to put another piece of filon over it, because there are a number of screw holes in it, as well as a hole or two that resulted from removing the bad wood
A new bunk board has been built, but hasn't been installed yet. The fiberglass on the passenger side cabover was peeled back to examine the wall, but will be reglued, since it's fine. The driver's side had to be totally rebuilt.