Gordon Murray comments in the article that iStream was an inspiration and lessons learned from that project were applied to the OX. And the concept is taken mu

Gordon Murray comments in the article that iStream was an inspiration and lessons learned from that project were applied to the OX. And the concept is taken much further too, the idea of iStream was to replace hard-to-manufacture precision moulded and welded panels used in consturcting the chassis with much simpler tubular construction (while using modern designs to get the rigidity and durability). The entire OX chassis is built with flat panels (from "engineered plywood", I think that's a wood + aluminium composite) and straight tubes, making it really simple to manufacture and assemble but rigid and strong. This is also where the race car designer background comes into play. Back when he got started, it was all tubular frame construction for the lower end and riveted aluminium monocoques for the top end. Of course his best known works are from the early carbon fiber composite era (mid 1980s) but his background in chassis rigidity must really help.