I decided to tackle some of the "patching" they said I needed underneath. there was no where it was clear thru, but I understand why they were suspect of some of it. If you decide to fiberglass under your car, do not take the advise of the salesman & buy the long-hair resin. It's a pain in the rump to use upside down. I put one layer on & decided to find a better way, the underside of my car had stalactites that needed a haircut when I was done. So, after using the grinder to make it flat once more, I found a better way. If you spread it where you need to & then use that press-n-seal stuff from saran wrap, it will all hold up until curing takes place, then you can just peel off the wrap. Worked better than I thought, won't win any beauty pageants, but hopefully none of the general public will ever see the underside of my car.
... I am letting them do the exhaust, I hate exhaust system work. Will work overtime to pay for it, if that tells you anything.