Anyone done a dual system build in one?

Long story short...... I have one on the way and have just noticed the dual system says 1xmicroATX and 1 x mini ITX.

As it happens I have 2 x microATX motherboards (necessary to have these particular boards)

In any event I was wondering if this case can, with some appropriate 'convincing, fit a microATX in where the miniITX should go. With the 2nd board it is a server board so will be fairly flat - no bulky graphics cards or anything sticking out.