The main problem is everybody wants a different kind of case, with different motherboards, divide that into the size of community and it is a recipe for financial disaster.
My gut feeling is the fantasy case made to take itx size motherboards, ie. Intel Atom/ion for Aros and Sam for AmigaOS would be the way to go if I had the cash to fund another project.
Personally as I am trying to get Aros onto Raspberry Pi the same case would be amazing to go with that card as well. But the only problem will be the keyboard.