I'm planning my Baldy/GMR century right now actually. I may keep it simple and do GMR->village x 2 + east fork x 1. I'm sure I can do 100mi/10,000ft, I'm just not sure I want to yet. At some point I'm sure the miles become junk miles and I'll just be limping along to the finish.
Probably try to get some 60mi/8000ft rides up there first, maybe this weekend.