buy a 3 foot section of threaded rod...the width of the rod should 5/16ths i think.. make a gimble joint out of pvc and skate bearings( heat the pvc to seat the skate bearings).. 5/16th threaded rod should fit nicely with skate bearings..build something to mount your camera on..and something to attach the weight system.. pretty easy.. I just kinda winged it and mine turned out alright.. pvc breaks when it is cold tho..
ill try to get pictures up soon.. it's at my parents house.. I made a glidecam for a t2i