Running on public roads is indeed becoming a thing of the past but a combined road/racetrack facility with part public road/part permanent might just work.
Runoff is always an issue so long straights with little runoff is as good as dead if the authorities have any say, as are fast corners with no runoff or 'brake failure' areas.
I have thrown a variation of your Chimay in, partly because I took a view of being as economical with the farmland as possible and creating the least interruption to farming activity.
The chicane at the end of the long straight is modelled on the one at the end of Conrod straight at Bathurst.
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