Thanks guys. Here's the next question
If I enclose it and want to keep the catheral pitch it has now should I vent at the end of each section (because there'd be no cross venting possible) or drop the celing a few inches using 2x4's periodically on the existing beams to allow for cross vent air flow?
I wasn't sure if few inches (say 4 or so) would be enough to really get the air flowing properly to keep it vented....
I'm going to look at pulling off the paneling they have up there now and see what we're dealing with and maybe just refinishing it. They used a really really corse siding (like the stuff you use on sheds) and it's sucking up the primer faster than we can get it on there. The walls are clad in the same thing and for a 10x20 room with 9 windows (meaning not a whole lot of wall space) we went thru 6 gal of primer!
The biggest benefit of enclosing it would be to keep that room a little cooler in the summer and a little warmer in the winter - hopefully enough so that we can enjoy it more than just on the shoulder months (we're in northern VA)
Again, thanks for your input!