electrical enclosure 3d model

OK. You provided a very good start for my electrical box. I need to refine it. Know that It will hold two circuit boards back to back with a 1/2" gap between them. I will need an internal rail inside to mount to (1/2" height mounted in middle of the box's height and running the 140mm width for my standoffs). The walls need to be perpendicular to the lids I need two lids - one on one side and one on the other so that I can access both boards). I don't need you do draw outlet holes. I can drill those. The dimensions I provided previously need to be clear space internally (140 mm width, 160 mm length, 90 mm height). Walls and lid need to be sturdy (3/8"). I need a channel so I can run gaskets between the walls and lids. The lids will be screwed as shown. I also need one of the wall faces to be removable so that I can slide my circuit boards along the mounting rail (screwed in place, gasket) (the are wired together). Compose in a way so I can export for 3D printing