Alongside your recent Acopone, a brilliant start on a career as a track designer.
Three things.
1. Unless you want to avoid being dubbed 'the new Hermann Tilke' don't ever use a protractor or a ruler or even a French curve to lay out a track. Nobody likes a constant-radius turn. I hate invaginated tracks that take maximum advantage of minimum real estate to squeeze as many 180-degree turns as possible out of the available land. Notice all the world's great tracks have brief-but-deadly highspeed turns (we're talking here about Eau Rouge and its ilk). Why do you think they're called 'natural terrain' road courses?
2. A survey of amateur racers revealed that they like increasing-radius turns more than decreasing-radius turns, uphill turns more than downhill turns, turns that go down and then up more then blind-crest turns (i.e., up-and-over...particularly if there's an unseen turn on the far side) and clockwise layouts more than counter-clockwise circuits. Bear in mind that these are amateur racers, not the consummate pros that we sim racers all think we are.
3. Leave some room for passing. If I had to find one thing to complain about WRT Silver Coin (which I can't), that might be it.
Forward!