I made this layout which in my eyes combines all the fast flowing parts of Aston, especially the last downhill piece, perfect for the big GTRs.

I blocked all the not used intersections and added some checkpoints, arrows, marshals and poles where needed or just cool looking

Try it, or watch the replay I took (2:30, rolling start is my fastest yet, with XRR)

I posted this already in that "New Open Track .." thread but now here, easier to find