[sllib]

John;
When you get your headers and side pipes get them uncoated; that will let you clean up any welding slag and smooth them out internally before you coat them. Get the coating done locally; shipping is very unkind to coated pipes.
I built a wheeled body buck with plans from Unique for their cars. I also made a lifting frame shaped like an "I" with arms that drop down and hook under the flares. An eye-bolt in the middle lets me use my cherry picker to hoist the body by myself. If you go that route make sure it's tall enough to clear the legs on your hoist. Good luck.
Bill