Welcome to the madness fastback.
As far as working on the 3203 goes, you've got to realize that you've got a bare bones backyard go kart with some pogo stick shocks on it and that upgrading it will require quite a bit of work to make the frame handle the modifications.
5 years of development of mine are in this thread. it's long, but read through the whole thing to pick out what worked and what i ended up ditching later on. Highlights a lot of areas that you'll have to address to beef it up.
http://buggymasters.com/forum/showthread.php?t=2243
and the latest project for my daugher with a quad front end conversion is in frankenbuggy portion of the forum under "Hatchet Job". might be the way you want to go.
BTW, where from in NJ? I'm just over the border in Easton, PA.