Not sure how to add this to the wiki but I did a thorough belly pan how-to on:
http://ecomodder.com/forum/showthrea...tml#post219175
for the Metro today. Cost about $7, took 3 hours. I used jack stands because I didn't have ramps but then was glad I did because it allowed me to lay the whole sheet of coreplast under the wheels for the initial shaping.
I did not have to build a frame and feel good about the not crazy amount of holes I had to drill.