Allan, as a chap whose exploits are based around a 25 Knot cruising speed, I wouldn't think you have the first idea about the forces involved in serious offshore racing!
Maybe you should check the RYA racing records before criticizing my driving ability. And before you say it, my 'pleasure boat' is a racing boat fitted with a few 'creature comforts' and gets used 'as such'
In my opinion, Offshore racing is THE most destructive of boating sports, and if one CAN build a race boat that wins race after race, without showing any signs of fatigue, or cracks, then why not with a pleasure boat?
Having said this, to build a boat without topsides and a deck to this level of 'integrity' would be harder than one with!
But not having topsides and a deck is your choice, not mine.