A little update, i finished redrilling and mounting the skateboard wheels to the frame and the rollers slide much better along the wodden frame so i'll expand the slot in the wooden rails for the larger skateboard wheels and then fine tune the tension on the rubber bungies. I'm starting to get the feeling there really isn't a whole lot of tension on them, just barely enough to keep the rollers centered.

I'll post a video in a little while.