This has promise, but my 200mm holes need to support M6 not M4. I decided to CAD my own as I didn’t want to drill out basically my entire walls and be mounting against pure infill. Anyway, someone needing M4 support all over will be happy with this design. I also like the slight bow in it!
Update: Added a star, mega-props to @majek_332431 for responding to my comment by now adding a M6 variant option. (edited)