Ok Rick here goes - Yes I used RC1 on everything. Even the exterior walls. And yes, you are 100% correct. The sheetrock is hanging in space there at the jambs. As far as mounting trim around the jambs I'll probably use Liquid Nails to attach the trim to the sheetrock. Of course the trim will be odd since the sheetrock stands our more than a standard non-RC wall. I'll post some pics but it'll be tomorrow. I'm working today for Uncle Sam and my son has a gig tonight.
My humble setup (at this point) is a DAW. P III 750MHz, 256 meg, removeable Maxtor (love them) hard drives, Cakewalk PA 9.0, Win 98SE (have XP but haven't installed yet), Waves bundle and lots of other plug ins, Aardvark Q10 (love it). I'll add a Matrox dual monitor video card when the studio is done - got to have more screen real estate!! Some outboard stuff like compressors, fx, headphone amp, patchbay, etc. Mics - SM58, SM57, Superlux drum mic kit, CAD E100 condensor, Marshall MXL V67G (just got it this week) with shock mount, misc Peavey and RS (Harvey Gerst recommended) tom mics. Monitors - M-Audio SP-8B nearfields and JBL 4311 Control Monitors (to be reconed after studio completed).
All the walls will have some type of treatment. I just won't know how much until it's completed and all the equipment/furnishings are in. The rooms won't be dead but as "balanced" as I can get it/afford. Except the vocal booth will be dead. All FX added in the DAW.
Floors will be painted concrete except vocal booth which will be carpet. Don't need to record the vocalist tapping his foot on concrete

. I hop to one day install a hardwood floor in the control room.
Glass will be 1/2" facing live room and 3/8" facing control room and vocal booth. That's 4 pieces. Cost is $409. It will be plate flass as I just can't afford laminated. Two pieces of 1/2" laminated cost more than the 4 pieces above. Sice is 3' x 3' @ vocal booth and 3' x 4' @ control room windows.
Hey, on a side note. I met Dennis Edwards (Temptations) at my sons gig last night. The club my son played at was in the same hotel they were staying in. Got a picture to put in the studio. I would have like to have seen their (Temptations Revue) show. Heard it was great.
Damn this got long!!!
DD