Many thanks for the different solutions and pictures! (I like the simplicity and cost of a 2x8 bolted to the transom, but unfortunately the motor would get in the way of one of my deck hatches.) I have a CLC NE Dory I can row, and I can always remove the motor later if I decide it's not necessary. However, my wife was on a crew team in college and she's not enthusiastic about rowing anything but a rowing shell - everything else is too slow.
This was Roger Peterson's boat, which was started in 2003. I'm hoping to launch by early July.