The main problem with what you are designing is the rudder controls, beam boxes, assembly time, and insurance. I saw a one off tri similar to what you are speaking in SF Bay in the late 1970s. It was a Sailcraft T hull with two 5.2 Nacra hulls. external beam boxes had to be adapted due to the experimental issue asd the fact that two boats were used. The rigging position became an issue [Tornado tapered non-sealed aluminum mast section] as well as holding the front of the 5.2 hulls in alignment. Heavy whisker stays helped with the alignment. The rudder controls kept breaking as well. The assembly time were excessive... anywhere from 3 hours to 5 hours. That's what stopped him from proceding with the development. He grew tired of spending so much time on the beach and not on the water. Also no insurance was to be had at that time... He eventually reassembled both boats.

fair winds,

thom