I had a friend once (the drummer in my band, actually) who had a family friend who built a ~60 foot fibreglass yacht in their backgarden in Mosman, knowing full well that they'd have to demolish the house to get it _out_ (they craned the bare hull over the house, but knew they wouldn't be able to get a big enough crane down the street to lift the fully fitted yacht including however many tons of lead in the keel back over the house). They planned it that way from the start - bought a cheap house on a good block, spent about 7 years working on the boat, demplished the house and hauled the finished boat out, sold the land and buggered off in the boat for a decade or so...
I also built a couple of little plywood and timber boats - a 13' dinghy for my year 10 woodwork major work, and a few years later a 14' catamaran...
big
Big you are full of surprises! I would never had thought you were a sea farer.
I used to sail Sabots and foreign hand on a 16 foot skiff every now and again. Man do they fly (16 footer)! Love catamarans, once there was a 36 foot cat beached at my local sailing club, found out the sailers got caught in a nice strong southerly. Broken arms and all just to keep her upright!
Those were the days of young.
Rob