David, I think Dan above hits the nail on the head. If full inspection of the frame indicates you are comfortable not removing the body, so be it; paint in place. I thought I could go that route with my Plus 2, but it turned out a new frame was required when we inspected things more closely.
If, as you indicate, you are removing the body for sure, I would prep & paint with it off. This worked well for me. The access to various areas of the body is much better, and the paint shop could easily handle the body on a steel cart. He also put an undercoating material in various areas, which was way easier as a raw body. For hauling the body around finished, I rented an enclosed auto hauler trailer with smooth floor, which worked very well. They have a smooth surface ramp type door with a very gentle slope and low approach angle, which made loading & unloading of the body reasonable when supported on castor pads. No real risk of damage rolling the body on & off.
Anyway, removal of the body is the key. It adds a considerable amount of work, but assures all is good with the frame and facilitates a lot of work, like fitting brake lines, hand brake cable, diff & shafts, etc.
One thing I did not realize at the start of the project was the amount of storage space & work space required. The complete body located off site for a considerable period of time during prep & paint ended up helping a lot. I am in snow country as well, and using my wife’s side of the garage to store the body off the car was not an option, and leaving it out in the weather even covered does not seem to be recommended. I got a shed to store all the various components while off the car or out of the frame, which worked well.
With the body back, I am just at the assembly stage now. Body off the frame is making access considerably easier. I have most of the separate components ready to go and stored in the basement; rebuilt heater, light pods, dash with wiring attached, flushed gas tank, etc… My plan is to essentially build up most of the body with the rolling chassis complete with drive train now safely stored off site and out of the way.
Obviously to each is own, but that`s the way I am doing it.
Here is a link to some photo’s of the body work showing the cart he used. You can see the Ali square tubing frame I installed at the Plus 2 jacking points located in the side rails, I believe the Elan is a bit different in this detail, and the body would just rest on the flat cart top.
halerconcepts.com/1971_lotus … ts_ltd.htm