I'll let someone else speak to the camcorder question...I just bought the cheapest used camcorder I could find on ebay that had analog input so I can expand my rig to include a vacucam eventually.
As for the mount, I'm using a one-sided version of this setup.
http://flickr.com/photos/snid/sets/1080130/ Mine only attaches to one seat, but it works great and is still very stable. It's easily made from aluminum square tubing, some u-bolts, and a monopod head like this
http://www.bhphotovideo.com/bnh/cont...ughType=search
The only tools required are a drill and a hack saw, but a dremel is handy.
