RX7Club.com - Mazda RX7 Forum - lots of body work! Quarter panels?

Well, ladies and gentlemen I am going to be starting bodywork on my car soon. and I need some advice.
My car is originally from Michigan (drove it out here recentley) If you know anything about Michigan, you will imagine the rust damage that has infected my vehicle.

so some questions:

My quarter panels in the rear are rusted through. however, it is only the outer fenders (the inner fenders are still made of metal :P) rx7s are unibody cars, and I read up on this a little bit, and found out that I can potentially compromise the structural integrity of the frame by cutting off/ replacing the quarterpanels. I don't belive I need to replace the whole thing just about the bottom 4-5 inches. (I think the holes are too big and severe to patch with fiberglass)

*Can I cut the qp's off of another car and put them onto mine safely?

I plan on replacing the front fenders, as mine are pretty janky (bent up as hell)
and filling in all of the dings, etc. then obviously getting the car sprayed. I am probably going to go with a one coat acrylic enamel.

I feel like I have two options here within my budget, after I do the body work.

A. take it to maaco, although the more I hear about them, the less confident I am about giving them my money. (any info?)

B. Buy a compressor and and an hplv gun with all the fixins, and tackle this myself.
I am fairly competent with a welder and a paint gun.

Anything I have overlooked, links, info, etc. is all grately appreciated!

I will upload pics tomorrow!

thanks,

-Miles