I'm considering recovering a fully sheeted a/c that has been covered in monokote. Does anyone have any good tips for removing the covering (it's been on the plane for about 6 years) and reconditioning the wood to accept the new film?

I always end up re-covering my Monokoted planes, sooner or later. Best way is to use a heat gun (and iron, as needed) to heat the material, then it'll come off pretty easy.

Reconditioning the wood depends on what's wrong with it....
There are a variety of "home brew' methods for reducing the effects of fuel soakage, discussed in a few places here at RCU. (Do a search)

I enjoy the process. When you're finished, the feeling is like having a "new" plane.

80 grit sandpaper.

I hate monokote. Takes a small miracle to get it off after you apply it. And I'm always having too re-shrink monokote. Put that stuff in the sun for 10 minutes and it gets all wrinkled.

Try Ultrakote for your next project..