I used these from
http://www.mcmaster.com/. They are adjustable so you can compensate for any non perfect fits to compress the gasket as much as you need (P/N 1807A62)
They are also lockable with a padlock



Same thing for the tongue box

Worked easy for me. I borrowed the idea from other builds on the forum. I started to look at the T handle but decided to much effort and not as secure or adjustable.
I then used a small boat stainless hand rail for more durable handle to lift the hatch
Good Luck
Dan