There is no easy way of getting multi layers of paint and bog off the body, any many different techniques. As gene has said paint stripper then put cling wrap over it so stop the stripping agents from quickly evaporating off to quickly helps give it a bit more zing. Very messy and you will still have to spend many hours sanding the panels after paint stripping.

A course paint stripping disc on a 4" or 5" hand held angle grinder gets it off reasonably quick if you don't mind the dust everywhere. Make sure you use a mask because you don't know what nasty paint could be on there. TIP, if using a stripping disc keep moving the disc around and don't concentrate in one position as heat build up can cause warping of the metal panels if you let it get to hot.

And let the hard work begin, best of luck,

Cheers Lenny.