Your first mistake was designing something around a third party board from the orient... One-off are the way those folks roll, usually around someone else' design. At this point your choices are either drill new holes in the case to accept a different board, or roll your own and move on.
Simple!
+-RH
Any more mistakes, or just the one?
It was a design decision and didn't realize I'd sell so many!
I know what to do, you don't need to tell me.
Thanks.
Str.