My point is if you can buy a CNC bent hoop, out of CDS for £100, why spend time messing about knelt on your garage floor trying to bend up an inferior product that probably wont fit right anyway. It just seems like a waste of time and money.
I agree with 'White 90' in that some people might buy a good quality cage in kit form, then mess it up because they can not weld properly.
As far as you not needing as strong cage for slow speed events, I would guess that rolling down a steep bank or off a ledge could have a similar effect to a much faster roll when comping