Gizmo may have got you a bit confused there Kiwi307
at the time we started the lefroy mini ( on a club level) the rules were length, width, seatbelt.
they still are

RULE 1a. MAXIMUM LENGTH (WHEEL CENTRES) 1640mm
RULE 1b. MAXIMUM WIDTH(OVERALL) 1510mm
RULE 2. Yacht must have an effective seat belt which must be worn correctly when sailing.
THe following are recommendations only.
yacht should have a brake.
Designs should take into account the Australian class 6 rules if the yacht is intended to be raced in that class
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we have tried to encourage experimentation in the lefroy minis whist keeping the wheelbase the same as the blokart so that there is a measure of equality when racing together.
the yacht in the building posts is called the "explorer"
there is still the skinny wheel experiment to do , the OTT experiment to do, the full body,wingmast experiment....................

lots to be going on with