DIY Roll Cage by "The Fabricator"
 

Has anyone seen this guys youtube videos? He does a fantastic job of explaining how to fabricate a roll cage without the need for a butt load of fancy tools. I found his explanations very easy to understand and he makes the whole build process look easy. He has a whole series of videos where he shows how to fabricate all sorts of neat stuff.

Yup I've watched them. He does make it look easy...