The aircraft stripper is great. The best i've used so far is marhyde tal-strip 2 aircraft remover. So far it is the best and i've tried just about every other product at oreily's, autozone, advance, and napa. I prefer the stuff in the jug as apposed to the spray. The fumes are a little better and you don't get the mist from the spray. The marhyde works great on the factory asphalt based undercoating. The key is you have to lather it on heavy, leave it for at least 15-30 minutes, and then have a sturdy scraper handy to dig it off. You will also need a trashcan handy to clean the scraper off.
Id have to say sending the car off to be media blasted would be the best option. In my case it was easier to do half and half. The under body was near impossible for me to blast because I couldn't shell out the extra money for a rotisserie. That is where the stripper came in extra handy. I also used a knotted wire wheel attached to my grinder, it helps a lot but is extremely loud underneath the car.
The coil-overs are from ground control. They are the 280z weld kit, here is thelink. The price is $399.99 plus shipping. There are websites online were they are a little cheaper but I didn't mind spending a few extra dollars to speak to their customer service reps. They are very knowledgeable about their product and i recommend going straight to the source for their parts. As for shocks i bought tokico illuminas from beta motorsports. I can't remember the price but John is an honest guy and I will definitely be doing business with him in the future.
As for the underbody i have some plans. I've been doing some research on diy undercoatings and i think ive come to a conclusion.