Tony - that is what started my "stint" of working on expensive boats.
I had purchased a vintage 30' Chris-Craft cruiser and the previous owner
had replaced the aft deck engine hatch covers with regular 3/4" plywood
and painted it (the top side only) and it was soft and spongy.
the marina where my boat was berthed was on a military base in PR
and it was full of "live aboard" military retirees of the upper ranks.
as I was replacing my hatch covers, the other boaters admired my work
and asked me to start doing mahogany and teak projects for their boats
because being a live aboard, they had no tools or shop to work out of.
(and they had scads of dollars they didn't know what to do with).
so in the three years I was at that marina, I think I worked on 42 yachts
in one form or another. and that is one job I really loved the most.
the inconvenient part was my house was a 90 minute drive from the
marina. so I had to take some very serious measurements from the project
to my shop, cut it, finish it, and take it back to the marina on the weekends.
so, making a simple mistake in measuring or design was not an option.
for most deck hatch lids, I used a 1/2" stainless carriage bolt that sat flush
with the deck with lock nuts on the bolt to act as a lifting handle.
here is a crude example: but you can see how simple it is and no trip hazard
or recessed handle to collect dirt and debris.
of course it is probably not appropriate for a residential application but
works quite well on a boat. I still have a big handful of the brass and stainless
piano hinges in 4 ft. lengths left over from that era.