The only guide to modern multihull sailing that I know of is the French sailing dvd’s:

http://www.multihulls-world.com/us/livres-262-the-catamaran-sailing-dvd.html

there are a few sequences talking with GASHBY and some clips of him on the A-Cat, but I don’t even remember if he gives any real tips. These dvds are applicable to all modern cats, but really not focused on the A-Cat in general.

I plan to re-watch these in about 2 months and I can see how much info is given to the A-Cat.

There are many A-Caters on this message board; you could probably get most questions answered here.

Matt