Captain:
Sometime, that is the answer. Commit to the repairs, but let the Pro's handle it so it doesn't consume the rest of your time.
If I have to do work on my older Lance at some point, I would utilize the Smith's CPES (Clear Penetrating Epoxy Sealer) on the wood portions. Regardless of what goes OVER the wood, it would be good to know that there was a higher level of protection or rot-resistance built into the wood itself.
This product is used successfully in high-end wooden boat restorations/rebuilds. The boats need to flex and move as they are used, but the inevitable water intrusion doesn't cause the damage it would on untreated mahogany.
For a period, the thought was to fiberglass the bottoms of boats (a similar thought process to fiberglassing the exterior wall of the TC framing). What is did on the boats was to trap moisture under the fiberglass that made its way in from the bilge, or from humidity. The resultant rot that formed destroyed the boats structurally from the inside... the fiberglass was found to accelerate the destructive forces of moisture. Fiberglassing was found to be worse than doing nothing at all, as the moisture would eventually evaporate when the boat was pulled in the fall.
The CPES was found to protect the wood better, give the old boats their cushy ride, and make the resorations last much, much longer. Check out the work of Don Danenburg from Michigan on the topic.
Good luck with whatever you decide!
Don
2003 Ford F-350 LB DRW 6.0 PSD, Ride-Rites
TorkLift SuperHitch with 3' Ext., FastGuns and Stable Loads,
Lance 880, Bison 3H Slant LQ GN, 1953 Chris-Craft 18' Sportsman