There was a writeup on the site a few years back that might help you out. It's at
http://www.vansairforce.net/BuilderM...nt_skirack.htm and here is a pic from the article. As for the C/G I would say 'it depends'. If you had the pax seat out and all the heavy gear resting where the pax would be and the baggage area was essentially empty.....might work. You'd have to do the W/B, of course, to see.
b,
dr