Thats a 'how long is a piece of string?' question. What shape do you want to make it, how high do you want it to be, can you put the bends in the right place first time or will you end up cut'n'shuting it. I'm guessing the MOD in germany has a big fancy bit of kit to do the job? I'd say wait till you have the chassis welded together then play with the roll bar. Your looking at 3mtrs min.
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