Car finally off to body shop!

Your plans for dealing with the underside of the car seem reasonable to me as long as you don't find any issues.The only way to detail your suspension is to remove/rebuild if you are so inclined. Remember- no bare metal parts, metal rusts. At least a coat of paint on everything. With attention to detail on the trim, the car will show well. With reasonable care, your car will last a long time and you will have a lot of fun.