Have you looked at Gary Dierkings boats? Wa-apa might suit you.
Have you seen Hans Klaars ontong java or the Wharram catamaran wakataitea?
Some info to be found on wakataitea on Wharram builders and friends.
Sorry Richard w - i'm not selling something - merely making suggestions according to what the poster asked......
If what he asked for was what...
How about an outrigger?
Gary Dierking -http://homepages.paradise.net.nz/garyd
Or a design yourself - like Glenn Tiemans in the pic.
Google or search this site for Ontong Java. Large catamaran/ndrua made by Hans Klaar.
The canoes it was based on come in many sizes. Papua New...
Sail on Ontong Java
You will need these.
This would work better.
Multihulls need a finer bow than that. Much finer.....
A very good article by Richard Woods from...
Read my last link and the report linked to that -- the cost is big and that is the problem....
There might be pitfalls.......
It's all about the money!
What's the problem - when were done with this one, we can just find another one....