Tim,
The spinnaker is not class legal in the Taipans.
So neither do the cat or sloop rig boats use the spinnaker in national or state competition.
As far as weighing the boats this should be done when you get a measurement certificate for your boat. The ply and glass boats are pretty much the same weight.

Regards,
Phill

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!