I used internal bungies much as you describe and they've worked out well so far. You can make a finger loop out of webbing pulled thru a slot, same as the deck bungie loops. The slots can be made by drilling a series of small holes and clearing the waste with a thin file or stick wrapped with sandpaper. It's easy and a little less frantic than a router.
Ian

: Hi I was thinking about hidden hatch hold downs.
: Two Bungy cords mounted to the under side of the deck, parallel to
: the beam, at the front and back of each hatch which hook over
: hooks glued to the bottom side of the hatch cover to hold it
: down. The only thing sticking up would be a knob or some other
: handle to lift the hatch. I think I saw them once some ware on
: line and was wondering if any body had tried this. Point of
: doing this is to keep the deck as clean as possible. . . Yes I
: would still have deck ringing for safety and gear storage etc.