Actually, the Portimao I released is a converted Simbin version, and a guy that knows the track well told me that the elevations are not very accurate. The Grid version is better in that respect. I had a raw conversion of the Grid track on my HD but it's missing many objects (fences etc) and would take a lot of work.
For the time being, I think my version, but updated by Marc_13000 and Gunnar333 is best version around.
I personally do not care much for reverse and other fantasy layouts.
I could release a realistic Pre-96 version, but then I would have to remodel the infield (the current road and pits were not there) and move the start and pits to the opposite side. Some releases by Legion are called 'faux' because the surroundings are not realistic at all.
I understand some like to drive layouts long gone, so do I, but I prefer it when the 'feel' is historically correct too.
I already started with a Croft 1995 beta, but it's very hard to find pictured and video from that era.
Example: I very much love the Spa 1938 released by Legion, but it's on my to do list to remove the Raidillon and Stavelot corners because they were built in 1939. Also the pits were totally different before 1939...
I just need more time