Which is *included* in the first posting, you are in absolutely, positively, unequivocally not in trouble at all!*
With this file DO follow steps 5, 6, 7 and so forth. If you've flashed SPRecovery, and not the update.zip file, if you reboot, I believe it'll return
you completely to stock. It's only after you've flashed Moto's update.zip does the thing stick.
I used these files and followed all the steps, and my phone is rooted and functional, and it still says "Android version: 2.2.2"!
RE: GPA 16 bootloop... I hear you have to wipe everything a couple of times before installing and that should do the trick. I don't know for sure since I've not put on anything other than the MC1 update zip
* Unless you do something silly like pull the battery or cable out while the flashing is in progress ;-)