Thanks Phil. Yes I had thought that might be the case. You probably know info'. below but it might be of interest to others.
According to my book "Bruce McLaren - A celebration of a Kiwi Icon" published by the Bruce McLaren Trust the T79 was built at McLaren workshop, Felton by Wally Wilmott using Cooper components such as uprights, steering rack, wheels etc. It was second McLaren project. A Canam car being the first. The T79 was designed and tested to run on 13" wheels and Dunlop tyres but because the tyres were not ready it initially ran 15" Firestone Indy tyres. This caused problems with the suspension but the car came right once up to spec at later Aussie rounds. You know doubt witnessed this at Longford as I did at Wigram.
Have started preparing the body you sold me. Have never made car with exposed gearbox like this one. Have managed to get BWA motor mount to fit so chassis should not be a problem. Not so sure about gears but you may be able to suggest what I need. Have 9T pinion to 24T Slot-it crown to fit at this stage.
Have found good write-up about T77 in Doug Nye's Cooper bible. States car ran with right side tank only. Have noticed later photos too show raise ducktail at back of T79 body. This was not on car when first raced in 1965. Two little extra moulding jobs for me therefore as body appears modelled on 1965 version.