I believe this was the IORC not the MORC rules that caused weird rule dodging designs.
a boat called Melonseed in our harbor, and that's what she looked like. The waterline max beam was about 5', and the max beam at the rail was about 15'. No tumblehome on this baby. Freeboard of about 2'. Weight about 3 tons (I'm guessing, but she was not heavily built or heavily ballasted - crew weight kept her flat.) IIRC she had a spindly fractional rig with running backs to keep it on board. An IOR design would have been more likely to have a masthead rig, and a bit longer than 29'11". The IOR guys had their own design issues.