I followed a different thread for awhile, but do not look over there often. I did get some rules from WHL in a pdf form a while back, readable as I recall, I'll see if I can find them on the puter. Looked similar to IRC rules of today.
Then to keep this rule going, with out modified way out there boats, yes, one will have to have minimum manufacture rules, kind of like stock car rules of old to use in stock car racing ovals.
She drives me boat,
I drives me dinghy!