We are still at the research stage, trying to integrate ATX PSU into the design keeping in mind the higher costs involved with SFX PSU.Which layout you are planning to manufacture??
I do think cases like NZXT H1, Ghost S1 and Ncase M1 will sell no matter what, but you cant just make rip off off those without getting in real trouble.
Actually I was thinking of getting into a PC case manufacturing, mini itx case to be precise.