Colin's right about the ply finish. There are so many beautifully-finished Aquaramas and Chris Crafts out there with umpteen coats of clear varnish that you'd be duty-bound to veneer the hull and then varnish it until you couldn't bear the thought of yet another coat. Then the deck would look kind of sad….and at the end of the day some clever beggar would tell you "I like your Riva".
Contrast that with a spray coat of hi-build, two of primer and three of Halford's gloss – Appliance White and Ford Oxford Blue or whichever non-metallic red takes your fancy. Easy peasy.
BTW I have a full sheet of different-size self-adhesive Union flags – less the two I used on Maid. Let me know the size you want and I'll cut 'em out and send 'em orft.
DM