They aren't hard to make, just the cost involved for all the parts.
I made my own and was surprised at the cost of all the bits let alone the labour time to build them and turn all the spacers on the lathe.
i was going to make my own as can't afford to buy a full kit just now and I'm pretty handy with a welder,, mccill motorsport stock all parts needed i think,
i was going to use 5/8" joints etc,,
Muz can you tell me what length are the tubes on the parallel bars?
scott