Actually found pretty much exactly what I wanted to make on another site.
Except some guy made his tube straightener out of angle iron pieces. Instead of a piece of plate steel with slots cut in it like I had imagined.
I went to two different hardware stores to find the wheel bearing 'U' grooved rollers but have came up empty handed so far. Quest continues.
I'm not sure if I can post a link to the H.A.M.B on here or not so I wont.
Here are some of the guys pics.