You can connect whole parts together by glue.
The design presents cable organizer from the bottom part and the back of top part.
I chose the following part as cover, thank you for that great design!
You can remix these parts as you wish.
I can not wait to see you made one :)
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You can choose high infill rate for "ghm_top.stl" for more strength.
If your printer can handle 60 degree overhang then you can print "ghm_top.stl" without support.
You should use support for "ghm_bottom_1.stl" for preparing to glue process as a next step.