"wildweasel_pt," I am guessing that 'cookie tin' is some-sort of vapor-recovery chamber tied to the open mouths of the intakes, & then to the oil filler?
The frame is what I like best, I think you have answered this question before, but, 'whose is it?' I think when you answered before, it was some UK firm, and I emailed them & never got back a reply, maybe if you answer me again, I'll try again, after all, I now own four VMax/Venture engines & who-knows where or when one is lookin' for a new resting place? Seems to me the answer is an alloy perimeter frame-lighter, better geometry, more-versatile, but you know, I like the shaft drive.