Le Mans as a permanent track has one fatal flaw that rarely sees it used is that as it is effectively a large loop people with limited space i.e. a garage, shed, loft, slotcar den, see it as a very inefficient use of the space available. This is the problem with most modern circuits although their are exceptions such as Catalunya.
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I can see what you mean, I'm quite tempted my the Brands GP circuit as there's not a huge amount of wasted space. It'd have to be properly done though, with the gradients etc. (And maybe that bit of the M 20 past the back of the loop as well.)
I suspect Google Earth may be my friend in the next 2 to 3 years.