Hi Steve ,-glad to hear your still kickin too -
sorry to hear about fam. health related difficulties.

Do like the concept ,--an 18 sq with spin snuffer .
New single handed spin class !! It may be a great way to get this class going again ,-it would bring a number of old 189 sqs out and prompt some new ones as well .

John l hulls weighed 30 lbs ea. boat weights could be under 200 inc spin etc , with 193 sq ft mains ,-roughly similar to 18 hts ,but having 10 or 12 ft or unlimited beam as 18 sq rules outlined gives the ability for one to hold it down and really create some extreme potential boat speeds .

Do have some basic concepts for such a design , think experimentation would be the really fun aspect of this type of design and development class .
A more extreme canted planning hull with an added set of forward molded in forward foils to balance the spin , with a spin set on extented pole to provide luff angle and use the huge lift a spin can generate would see this type moving at speeds beyond the 18 planning skiffs.
The exact shape,- area ,-and angle of the forward foils for cats requires some refinment ,but working models on the 60 tris and other experimental sailing craft provide good basic parameters .

fun stuff -