I replaced the front half of my floor with the front wheels on a pair of metal ramps. Not that I wouldn't have liked it higher but it worked fine.
Also: What Cairo said. Be SAFE! Wear your ear and eye protection. A good pair of protective gloves, too.
As to bracing the car, you only have to contact Chris at Tangerine Racing for a set of adjustable chassis braces - shamelessly featured in this very pic!
http://www.tangerineracing.com/tools.htmOh and post lots of pictures of your work, else well beat you about the head and neck with:
Now get to
so we can all
and
over your car!