I sail a 15' Venture Cat, made in 1972 by MacGregor Yachts. Anyone else have experience with this boat?

This is my second year of sailing, so I'm a newbie, very interested in do-it-yourself modifications and sailing tips and techniques.

Right now I'm modifying my mainsail, putting in reefing points. I hope to start racing next year.

I've turtled my boat once, very hard to right. Had to have a sheriff's boat flip my cat, snapping a shroud and bending the side rails. I've fixed it up and it seems fine, but I sure don't want to turtle it again!