Thank you Darryn,

I'll try some experiments soon. I've been toying with a few ideas for building my own boat for some time, but I want to be sure that I can do it a) as cheaply as possible and b) the way I want it rather than having to incorporate proprietary extrusions etc. that might not be ideal to the way I want it. In particular I wanted to try and develop a 'one piece' style of construction where the beams are blended into the hull once all is bolted together and avoid the current appearance of all catamarans where at best the hull is faired to allow the beams to sit into the trays and give a smooth appearance.

I've just read what I've written and I don't know that I've made myself clear.....

I want the beams to form the fairing at the hull junction not the other way round.

Anyway it's just a sort of idea at the moment.

Thanks again Darryn.