Ok all done and tested, my homemade free motion rollers are up and running and i must say it's quite a odd sensation at first. I was able to ride a little smoother, ride with no hands much easier, ride out of the saddle to simulate climbing, and of course sprint out of the saddle and not once did i hit the little red roller i had positioned in front of the assembly for safety.

The skateboard wheels made of bone(very hard) with abec 3 bearings and work perfect and move the rollers perfectly, i don't think i'll have to buy any Alu to make a lighter roller frame out of.
I ended up using a 30" adjustable elastic at the 22" mark and barely stretched it out and clamped it to the rollers. Looks like the key is not have any tension on the elastics to allow for suble movements in the rollers.

Anyways, here's the video(10mb mpeg1) and a screenshot for while you wait.



And some more pictures..






Derek.