Here is a letter I received from Greg Goodall at AHPC:

Hi Mary,
the formula 14 class is a interesting concept and hopefully will become
popular.
Unfortunately we don't have any plans for building a 4.3 catamaran at this
time. The taipan 4.3 that we built a couple of years ago was only a proto
type adapted out of the taipan 4.9 moulds. This boat was sold 18 months ago.
We do not intend to do any further development on the 4.3 at this time.

Regards,
Greg