Thanks for your prompt and helpful reply.
The Catapult is a fantastic design. Too bad they are not making them anymore. Thankfully it inspired the Russians, who will be making my pontoons.
I think the Catapult is a bout half a meter longer, and certainly a bit heavier than my boat will be. I will be sailing exclusively in the Mediterranean off the coast of Israel, not in inland waters, so I am concerned the 10sqm sail may be a bit too much for me.
The other manufacturers of inflatable cats today are using a 7.5-8.0 sqm mainsail, along with a 3.5 sqm jib (which I plan on adding later).
Very useful site thanks.