Thanks for responding Jack.
I have fond memories of skippering your 20 flying your spinny 3 up off Sandy Hook the day after a SHBCC Statue Race. I wanted to confirm that I was on the right track before I invested in parts that would not work together. Not that I have found them yet.
Still want to get back and do another Liberty Race. Perhaps on the Wave with spinny!
The 20 has different rudder blades than the others, but EPOs are nice if you want y to spend the $$$. You don't need them to be competitive.
All the castings will work. Tiller arm tubes are the main difference boat-to-boat.