S1 having some tlc

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Nine years of neglected car in a garage and then some tlc all four quarters now done.

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Before

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I've done all wheel assembly's and chassis on the four corners plus all the engine bay, I removed the exhaust system and opened it up fitted new baffle tube in front section and repacked front and main box then rewelded up all in stainless steel when the exhaust was off it allowed me too clean treat and repainted all the centre section of the chassis from front to back, I still have the out riggers to do, bleed the brakes, new rear screen to sorce and fit then in for the mot will be back on the road for the spring after sitting in some ones garage for nine years. It's not a body off job I would rather have it on the road.
Does anybody know what the rear screen thickness should be, mine is .5 which I think is a bit thin ?