It certainly has the look of a late 70s Peterson design - particularly the stern/counter/rudder arrangement.
As to who built it, that's an open question. Look for a stamped identification number on the transom, but if it's a one-off, and from the 70s, there likely isn't going to be one.
Peterson is a designer, but many builders used his designs, especially semi custom builders of racing hulls.
Hopefully someone will recognize it for you.