Sail selection for DIY inflatable sailing catamaran

I am in the process of building my own inflatable sailing catamaran. It will have 4.5 meter long pontoons (50cm diameter), and the beam will be about 2.3 meters. The mast will be about 5.8 meters high, and will have a profile for sail rope.

I need to order a mainsail. I think something 7.5-8.0 square meters. I really like the cut of the sails of the Happy Cat and the Minicat 420/460. Does anyone have any idea on the luff/leech/foot of these sails? I know they have at least 4 horizontal battens. Looks like Happy Cat has some kind of boom sewn into the sleeve of the sail. Interesting approach, as I am also going for simplicity and ease of assembly.

Thanks