Jonathan wrote:

I would appreciate anyone sharing any first time goofs that they can
remember (and bear to share).

Since you have two pieces of plywood, and you probably store them flat,
the top piece is becomming warped. Make sure you use enough ties to
even your bow/stern. My first canoe is named "Ugly Duckling" for a
reason. Mr Payson recomends laying the warped plywood concave side down
on the lawn for a few hours to correct the warp.

Mike.