Sailboats built by Helms - Jack A. Helms Co. by year on Sailboatdata.com
or this? (Designer of Helms 27, Stuart Windley)
Sailboat designs of Stuart*Windley by year
Are you planning to race? If not the PHRF doesn't matter much unless you're just looking for comparable boats in the 'speed' department.
You can get a variety of stock premade tillers from Defender, etc, also this popped up:
A Stock Tiller - Mahogany and Ash, Rudder Craft Inc.
But they are not hard to make yourself either, if you have some basic woodworking tools and skills. Metal and composites are also to be had if you'd rather.
Welcome to the site.. enjoy!