Lots of interesting tech. questions for a newbie, but that's good!
One of the best pictures of a "homebuilt tri" I've found so far is the 'Trinado', which uses Tornado hulls.
Based on the comments here, and the Trinado's builders comments about a bit too little righting moment, would a smaller main hull not be the answer? What particulars would be involved in choosing a preexisting hull for a good match if there is one? I'm aware that all this reference to salvaged parts "on the cheap" may read as sort of pathetic, but the upgrade to a quality boat (read: tamer, drier) of 20-25' from my WindRider Rave without over a $20K investment is most realistic.
Next question to me would be what's the best, (reasonable $$) option for a good folding assembly?
Mark