Greetings all,
I built the "Yankee Tender" 20 years ago and am now going to build another.
This time, as a fun thing with old friends, I would like to make it out of Home Depot "Ca, Ca" wood and galvanized nails, etc. (As a lightning arrestor to the gods of boatbuilding, I will paint it and call it a "Utility Rowing Skiff".)

My question is:
PT plywood or exterior sheathing for the bottom?