There are many more qualified than I but I will try to bring your question back to the top.
I see that the M2N68-AM is compact so you are asking if you can put a small MB into another case. Well, a case is a case is a case so I GUESS you want to know if the fixings will match? Try putting the MB in the case 'loosely' to see if the fixing holes correspond with anything in the case.
I assume you would have to check the suitability of any power supply.
I hope someone better qualified will take this up.