Let's admit it guys, great boats have been built "as you go", including much of the British Navy that ruled the world in years past. But, every now and then, things don't join up as you expect and then you can back up, put some material in the fire pit and try again.
I suggest that the books by Phillip Bolger might be of some help. He designed MANY boats, some normal and some not so normal. And Dynamite Payson built them, either way.
Seems like he had some neat outrigger designs if I remember back. His books are available at Amazon or on eBay usually, evenif out of print.
Piper