Fantastic build! The iconic uphill section is surprisingly good. Chevrolet Camaro Z28 Race Car '69 got a fair bit of air over the final part but there's enough braking distance before the next corner.
In GT2 (the actual origins on this track) hard-tuned cars would be airborne for so long there was no way to slow for the turn.
That raises a minor issue: the track feels 10% to 20% too long. That's why there is a sufficient landing zone. But worse, sadly: corner apex points are far too long in key places.
Also, the exit to the final sector bus stop section should be much more open than the entry. The offset for these chicanes should not be so big, too. Overall the track just feels too big - but the width is a perfect balance between the huge freeway sections and tighter city sections of the original.
Tightening the track would be yet another complete rebuild? You could absorb the over-long pit straight by making the back straight too long. They are nearly parallel. And the back straight always felt ultra fast due to it being downhill all the way - with a steep middle section.
To get so much of the original feel into a track on existing terrain is hugely impressive. Easily 4 stars in this form. Would be an easy 5 stars with corrected scale and with the original's increasing-radius sections made more pronounced to suit GT6 physics.