You should have no problems with 400 sq ft... The biggest space eater is where to put the body stuff while working on the rest...

The pieces are all light weight, you may want to build something to get them up overhead to keep them out of the way. I've been dioing work on a table under my 4 post lift... the body parts are on plywood across the lift.

Go Vertical! LOL

When you do an oil change do you worry about a sexual harassment suit? ;-)