Last night I borrowed some measuring equipment from work, specifically a digital protractor, venire protractor and a laser tape measure.
And with the able (if not quite willing
) assistance of my girlfriend, re-measured everything and checked as many of the angles as possible, the zero button on the digital protractor helping a lot as it removes the slope of the chassis due to axles stands of different heights on a slightly sloping garage floor.
Most of my tape measurements were accurate to 1mm, and pretty much every rail is at the angle it's supposed to be, with the exception of the sides of the cockpit where one side is 3° too steep. I think I can live with that though.
Standard bodywork isn't an option for me anyway, as i'm fitting a Saab turbo engine mated to a BMW gearbox, and possibly fitting a bigger fuel tank. The only standard bits that would have fitted were the side panels.
I will now be checking the TT against the modified chassis dimensions for the MT75 gearbox, as I suspect the chassis was modified by the second owner to make a wider TT. All of my drawings for fitting the E36 BMW gearbox in were based on the standard chassis, and it was looking tight, so this might actually help me out.