Originally Posted by richp
I confess, the more I follow this thread, the more I think that the simplest and cheapest answer is two cross-bars about a foot apart, with a board strapped across them, and a throwable device strapped to that as a seat pad.
That occurred to me, too, but what about the oar locks?
Maybe 2 cargo modules? one with a seat, and another with the oarlocks?
Or a 34" long (fore/aft direction) cargo module with an extra cross bar? Seat goes aft, where the doubled cross bars are. Oar locks go near the front. The forward cross bar could eve be a foot rest.