I Think I have the very boat your looking at, but it's actually a 19.5
Great boat, I love it. lots of room, set up to fish
like a fishing machine
The glass is solid, the deck is plywood but I have no soft spots. I was cutting in some through hull fittings last year, hull glass is thick and solid. gunnel's are cored, and again very solid.
I take the boat in the ocean often, works fine. But you need to choose your days, not a boat to go out in a small craft with, you'll make it through but you will get your but kicked and you will be wet. Fun though, I scream at waves like a crazy person the whole time.
Did you have a boat in mind or are you still looking for one. I've been thinking of selling mine, I have upgraded to a 23' boat with a cabin that is yet to be splashed.