I wouldn’t use anyone else (or at least very few). Era has been building and racing rotarys longer than you will remember, quality service with quality parts. Don’t be surprised if he is busy but worth the wait
I have had my engine rebuilt by Era, he has been building rotaries for over 30 years. Extremely thorough and transparent, he will even let you source parts yourself if you can find them cheaper. The entire build is documented via a private photobucket account and he always answers the phone to answer questions