Jeff-
You are in the right place (Aus) to do this! All you need to do is get a nice used Taipan 4.9 main (the class just recently "updated" the class main to a fathead square top so there should be lots of nice older mains- heck I've got 3 but shipping you one over there might be too much!!), cut your mast down from the top, build some nice Blade hulls or even Taipan hulls and you are set. The original Taipan was based on the old Auscat so used all the same boards/rudders/etc. I would love to have a radial traveller on my Taipan! If you are used to them on "A"'s it won't be a problem IMO. I also have an old "A" woodie- a Lindahl design so it has very long sterns and I could even cut enough off the sterns to shorten it to 5m and turn it into an F16! It's too heavy now for "A"'s but should be about right for F16 weight!
Another option for the sail, not as good as the used Taipan option, might be to cut the top off and add some sections at the bottom to increase area?

Good luck!

Kirt