I've a done an entire exo cage turned truggy and will say that the #1 downside is that you have to use heavy .140" wall PIPE. You can get decent results, and with enough triangulation a safe, yet heavy cage can be built. I think that being said I would only do some sliders and bumpers if I ever had to use one again. I love my JD2 TUBE bender.
Pipe...
