Yes, that would be totally possible. Ethernet wing, or FeatherWing tripler, and LCD cutout, with ethernet cutout on the side. These are modular enclosures, so each of the 6 sides can be customized individually.
If there is enough interest, a custom solution for a particular version (like the Ethernet Wing and LCD cutout) can be done.
And since the enclosures are stackable too, you can mix and match with other enclosures to make a bigger whole.
PS - For right now, you can quite easily drill mount holes for the Ethernet Wing on the base plate, and mount holes for the 2x16 LCD on the top plate of the ProtoStax for Breadboard/Custom enclosure, using blue tape (to protect the surface) and a drill.
[Since it is a transparent enclosure, you don’t need a rectangular cutout for the LCD, and it is easier to just drill holes vs. doing a rectangular cutout) - you can mount the LCD using some spacers and screws and nuts]