Once you remove the doors, trunk and hood and fenders, the bare tub is quite easy to lift with 2 people. My wife and I did mine a couple of times although she swears that she won't attempt it again. Now I use a couple of woven straps and a cheapie hoist to lift it off of my project 4A when I need to. If you're planning on leaving everything intact in the tub (seats, inetrior etc), that's a different story and will weigh in much heavier.
For a body support frame, all it takes is four sawhorse-style supports and two runners underneath. You can knock something together for little $$ and it will work. Make sure that it's wide enough to let the frame roll in and out from under the supports to work on it.