I am a fan of the original Seattle track having done many laps in GT3 and GT4 and I was thrilled with this mod track. It isn't finished and can't wait to do more races on this track.
There are issues to resolve like the AI at the top of the hill, but I also remember being able to take more curb at the exit of the top of the hill and through the double chicane near the end of the track!? This track for me was all about riding those curbs!
Finally there used to be a tram track you crossed too? I don't know if that is needed as may cause more issues.
Done a little video showing the current stage of the mod, and hope to cover it again in the future!
https://youtu.be/F-v-DAOmjrM