I've been having fun with your spreadsheet, inputing BigCat 65. It seems to me that some of your parameters diverge from what I have seen as typical for midsize cats-Narrower overall beam, higher sail area, and lower PCs. Materials costs-do those include equipment
such as engines, winches, etc? Materials costs seem high for just the structure, unless the materials are the best rather than average.
Plus, a lot of water
. 3800 liters = 950 gallons = 7600 pounds. Guess not everything scales exactly. Is the wetted surface for one hull
I expect to reef at 23 knots, -my design is beamier than your paramaters and has less sail area and less air draft
(unusual rig, lower CE than usual-biplane and not marconi rigged.)