Made a few changes to make things a little easier, and I extended the length of the latch and the depth of the latch catch to make it more reliable. This is now designed to sit flush, not on top of the hatch. (You need to remove the glued on wooden pieces as they are no longer used. Also you will need to carefully cut some of the foam so that the printed parts fit as the pictures show.)

Rather than using bamboo or wooden dowels, I used 3mm carbon fiber rod/tube for the front pins, and also for the latch handle. (I made the holes smaller so that you can drill them out to whatever you like)

After printing, test that the latch slides smoothly in the housing if not use fine sandpaper to clean up the edges of the latch. Now go ahead and CA glue the latch housing together, but do not put the latch in place yet. Once the glue is completely dry install the spring into the latch then insert the latch into the housing. Now put a single drop of CA down into the hole of the latch where the carbon fiber handle goes, then push the latch all the way in and insert a short piece of carbon fiber rod into the latch hole.

You will need the spring out of a pen or mechanical pencil

Note, the rear latch catch plate has holes incase you want to drill into the foam and glue in additional support rods (flush) for extra security. (Mine was glued with Uhu Por, and I am 100% confident it's not going anywhere, so I did not use additional rods on the rear plate)

My hatch will be spray painted all black once I get to that point