I think you have to give the sadly late Mr. Britten his due for the astounding results he achieved with limited resources in a relatively short space of time. The good die young is only too true in his case.
Well maybe not but the bike was designed and built by a man who's thinking was about 10 years ahead of everyone else.
It wasn't built at Ducati Corse or HRC, the Britten was built in John's workshop and home surely makes it one of the greatest achivements in motorcycle history.