Need help with Phinisi/Dhow/Schooner design

[PAR]

What you need more then anything else, is an understanding of yacht design. Software can not provide this understanding, nor can it overcome any short falls in regard to it. If working on pretty computer generated pictures, you're off to a start, but as far as this design floating where you think it might, let alone not immediately capsizing on launch day, well you've got a considerable amount of studying to do.

Buy the book "Principles of Yacht Design" and absorb it's contents. The questions you've asked will become answered and of course you'll have more specific questions, where a place like this can be more helpful.