The usual extra info on this series for the new GT3 cars...

There are 42 events (36 Trophy + 6 TT) with only one of the cars necessary to complete the series.   The rewards 25-50-75-100% are split M$8k-14k-19k-29k.
To complete requires PR 82.7, but you can reach 25% at ~70.8, 50% with 74.9, and 75% with ~78.6:

Incidentally the final two Cup events are a 10-lap Daytona Road paying M$100k+, and a 12-lap Spa paying M$155k+

Upgrade tree is here