I think it's quite difficult to make a case for the card which will safisfy every preference:
Here we have ACA500, ACA1232, Subway. One could replace the Subway with the planned USB/Network module (whose dimensions are unknown, to date) and add a Delfina instead. That would need a really big case.
Others would perhaps only want to plug the basic ACA500 (you don't need anything else for comfortable classic democoding
) and prefer a smaller case. Maybe it's not the time for nailing case specs, yet.
Knowing the community a bit, I'd guess there will be multiple solutions...or none. There will be complaints in any "case".