Thanks David. I've sent for the Alphagraphix catalogue and like you I'll probably use the kit as a drawing to scale from. I've already made a basic drawing on CAD using photos, but the kit should help to firm up some dimensions and proportions. The model will be in 5" gauge - rather larger than most models discussed on here! It will be powered by an electric motor and it should be capable of pulling an adult around the track at the MESNI site at Cultra. Due to the size of the batteries, controller and motor, it may not be possible to fit any kind of interior, but hopefully the design work will prove otherwise!
I'll keep this thread updated as work proceeds...
Keith