We had our 48 Sea Ray Sedan Bridge in this shed; 52 feet overall plus 6 feet of dinghy on a rear davit. Lovely shed but I really can't justify the moorage expense ($13K) for a 30 Grady. You could probably squeeze two Marlin 300 boats in this shed.
I always wondered how these things would do in a storm. Doesn't seem like there's' much to it. Would be nice to get longer than a month out of a wax job. Something to be said for undercover storage.