Thanks for allowing me to join your forums despite the lack of a 7.
My current project in this area is the design and build of a facsimile Rocket, the motorbike engined tandem seater designed by Gordon Murray in the 90s and built in very small numbers by Chris Craft in that period. About 50 built as I understand and a collectors item now. The original used a spaceframe chassis, 1+1 seating, 1000cc Yamaha engine with bespoke and expensive transmission that included a reverse gear. Car has the appearance of a 70s formula car with cycle guards. All up 385kg.
Unfortunately I don't have access to the original design (it wouldn't meet our LVVTA requirements anyway) nor to the sort of money involved with the transmission. So my design will be different in many areas, although it will (hopefully) look much the same, albeit a little heavier. I am using a Honda CBR1100XX (Blackbird) engine and gearbox and a Mazda MX5 as donor vehicle for uprights, brakes, diff, steering rack and other odds and sods. So there is some commonality with Locosts etc using this source for components. Intended use is as a fun road car with the possibility of clubman type racing.
Currently I have concept approval from LVVTA and am currently working on detailed drawings.