: I`m planning to incorporate Mr. Leidy`s underdeck bungie system to the
: hatches of my Coho.

Good.

: The "finger divot" system for lifting the hatch doesn`t seem
: appropriate on a plywood boat.

You could also make a divot for plywood if you choose, I think.

: I guess you could hang a small tab of fabric or webbing on one edge of the
: hatch for a pull; any other ideas?

I used inch webbing, one side is the leash for the hatch abt 1.5 ft, other side becomes a 6 inch loop of which abt an inch sticks out from under the hatch lid when it's closed. Doesn't seem to leak much if at all. The webbing is screwed to a small ash block glued inside the hatch cover, matches the hooks, sorta.

: Any insights or refinements (bungie orientation?) would be appreciated.

I used 1 hook and loop on each side of the smaller fore hatch and 2 hooks and 1 loop on each side of the larger af hatch.
Presume you have gone to the source already but here's a handy link in case.

Jim