Louis, youre right, Eric Taberly did have success with his tri but that was around 40 years ago if i'm not mistaken. If you were to ask him today i'd put money
on him having some carbon, epoxy
,kevlar, nomex,foam monster.
Steven, while I have never had a problem with an ally boat, you will have to be carefull of electrolisis. I have seen and worked on boats that have actually had bubbles along the waterline like an aspro disolving, and have cut vast lumps out of said affected boats after 12 mths in the water
Also you can't use copper based antifouls and ther are a few other probs for the unwary.
Do your homework.....Saying that, if these problems were adressed properly I would think about it but maybe a 40 ft cat on 50 ft hulls so as to carry the extra weight a bit better.
Steven, the cat im building at the moment will be beached regularly as was my last one . All we did was put 6 layers of 600gsm double bias about 300 wide down the centreline with staggered edges and if you really want to get carried away put a ground macadamia nut shell mixed in with epoxy
shoe down centreline while hulls are upside down.
I can assure you that this is more than adequete [ unless belting into reef and rocks]
Hope this helps