A few weeks ago I built my laser-cutter-case Zynthian. I made some improvements to be able to close and service my Zynthian. Before I built the case I sprayed the parts several times with a transparant varnish.
First of all I glued bottom, right side, front and rear. Then I glued two woodstrips ( 7 x 7 mm) at the top panel:
With two screws (left and right side) it's possible to close the case: