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Think I'm starting to concur with the general opinion, that it may not be worthwile, will do the tuft test down the track. Took the spirit level out today and ran it over the roof, even though it looks flat, it does have a curve over it, not much, probably 1-1.5", but as said that may be enough to hold the airflow attached.
Working from the front at the moment, have sealed the grill, leaving 2 holes, 2x5" open for radiator. still a couple of small gaps to seal & smooth out.
I have had a variety of under bonnet (hood) temp gauges in place for a while, the ex radiator coolant temp has increased to 60C from 30C, but engine bay temps still the same, so the hot air is still being drawn out effectively under the car.
Once I finalise the front area, including tuft test on the top of the bonnet to determine if there is any value in adjusting bonnet profile, then I will look at the roof again.
Thanks for all the input, much appreciated and it made me think more deeply on all the relevant issues.
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