Todd,
I've made holes like that before. Some times you need a trap door!
I've looked at the Farrier Trailertri 720 design before. Nice pocket tri. To put things in perspective just think the TMS-20 obviously has less accommodations like butt and beer room only but it is only 3 1/2 feet shorter LOA, the beam is 8 inches wider, and is 1200 lbs less.
Two different design ideas but as saying goes there is only one kind of a boat a cat; but there is 1/2 a cat and a cat and a ½ also! I hope the Americas Cup brings more attention to trimarans.
Good luck with the project post some pictures!
Mike