I don't know if this is really applicable as I am not familiar with the small boat
route, but the Grampian
26 I bought out of the Sound Boat
Works in Perry Sound draws about 5'3" and it had a nice chunk about the size of my fist taken out of the botton corner of the leading edge of the fin. Solid cast iron, gone. Like a shark took a bite of it.
Lots of nasty granite out there, so you'll have to be very careful with a deeper draft.