I usually tend to be in the same boat as BattleHymn
I just finished up giving the Coach a Brazilian, it is a big job, a lot of wax on an wax off. I will up load some pics when I get a minute.
You really don't want a grain of sand in the clay bar. Better to get a new one. I use Maguire's spray detailer when clay baring, but used Mother's Step 2 Brazilian Cleaner and a Porter Cable buffer on the Coach . Clay baring the Coach? Not going to happen.
It was 116 deg in sun in the backyard when I came in although the coach was in the shade. Air temp had to be in the 80+ range so it was getting to hot to apply wax if I hadn't already finished.
Nice pics Chris. Seat covers? Get an upholsterer it will be cheaper in the long run. Heck head to TJ for a Vacay and get it done there.