This concept involves using real tracks to create an ultimate track. For example, Martin Brundle has created his.
This thread is not the same as the track designer thread as that allows you to create any fantasy track using any type of corner, this is any corner from real world race tracks.
Well, I would start with the Nordschleife (yes, complete) with the 24h variant for the last turn (leading on the GP Part) and taking the Nürburgring GP Part until after the Mercedes Arena. After this, I would combine Eau Rouge, Blanchiment (Spa), Ostkurve (Historic Hockenheim), Uphill Section of Bathurst, the Esses from Silverstone, Corquescrew (Laguna Seca), Porsche Esses (LeMans) and the Hammerhead (Top Gear TT).
Not in this order, but in a order to guarantee a track that has a great flow to drive (just like the Nordschleife )