Quite expensive, if I remember correctly.
£90 for the wheel (Momo 11 from rallynuts)
£80-90 (depending on exchange rate) for the adaptor and delivery, took a bloody age to deliver maybe 5 weeks.
TBH, I think its WELL worth it, the wheel is like nothing else out there, plus the paddle shifters are 100 times better than the standard ones.
Could you make one yourself?, no doubt, but I think the Frex adaptor is a very nice piece of kit, and there is no (or little) chance of buggering your wheel up, buy a DFP and the Frex, I doubt you would get better than it.
Dan,