This from Australian High Performance Catamarans website:http://www.ahpc.com.au
We purchased a plug from Peter, however it was not to what we wanted so we made these changes:
2 part mold, seam down the centre of the hull
Beam moldings set up with captive nuts, and fairing on rear beam.
Additional fairing of the whole plug.
Construction remains similar to Egner’s version, being a hollow shell with just 2 frames. The joins at the deck and keel are full strength joins. A new joining technique had to be developed to achieve this in the closed mold, and we are very happy with the results.
A distinction from the European Flyer is that ours has the seam hidden under the non slip so the boat has that final finishing touch. <<<
Not the whole story of course but it gives some clues.
Below are some photos from the same place:
Flyer A-class in mold.
Auscat A-class in mold.
Finished Product (Flyer A-class)
Finished Product (Flyer A-Class)