I had a look through to see if I could see another thread about the same track but I couldn't find one, so here's my new edit of Interlagos:
Here's an overhead of the circuit, black=GP circuit, green=alternatives
Interlagos is a good track to edit because it has nearly all of the old routes still there, although the original Sargento loop that I've left out is partly built over. I've carefully designed the Esses (well, actually, at the time, it was an accident!!) so they slot through a narrow gap between the buildings - there'll be no problems for run-off
Also, a very similar layout to the original would be restored for the new Interlagos 12 hr endurance race (this is made up by me before you have any ideas). The current layout would be kept as a national layout, and there's also an intermediate layout which uses the old circuit as far as the old Ferradura where it instead turns right onto the current circuit. In all, this makes Interlagos much more flexible in terms of layouts - for the Brazilian national series like the Brazilian Stock Car Championship, they could hold 2 races on the circuit, both using different layouts (like as is at Brands, where they use both the GP circuit and Indy circuits for separate rounds)