Mary where were you when I was seeking a box rule development class as the F16 rules?

Unfortunately the only box rule classes I know of in cats are the original International classes A, B, C and D As well as the 18 Sq (I haven't read the F14 rules).

The reason the majority didnt go this rule route was, the idea we wanted to be able to sail at a similar rating as the F18s. Thus it was required to have a similar handicap using the major handicaping systems used currently. Seems the Texal system has a very convoluted way of "mathematically" assigning a rating to a boat. Anything outside of its simplistic ideology is heavily penalised.
For example of the "Hooter" would drop the F16 rating unrealisically low. So instead of racing a F18 boat for boat we would be starting almost with the new rigged Tornado.

Comparing Formula classes and one design.
Formula classes arent quite as restrictive as a one design. The Blade F18, Capricorn F18, Nacra F18 and the Tiger F18 are strickingly different designs.
Typically a one design has a series of measurement points along the hull and allow for builders errors only. They may have set point and measurements on the rigging and sails as well.
Then one has SMOD which require every hull to come from a mold or an exact copy of one mold. With every aspect of the oat strictly covered and generally supplied by the manufacturer.

Stewart