zefarelly, what do you think of your rollcentre cage? I hear widely rangine mixed report over thier prodect, but they are the only people that list a cage for my car...
There are good arguments each way. Welding is stronger but makes the surroundings brittle. Bolting can be as strong, if not stronger, but in a large impact is more likely to fail (from what I have read)
weld in cages need not be multi point. they are quite often the standard 6pt cage. as GTV said, any cage is only as good as its mounting points which are generally going to be thier weakest point.
I would weld mine in but the car is fibreglass (no matter what the rollcentre site says!)