ps if there is to be I/O on the top panel, then a case longer than 17" (84hp) would be required.
My personal preference would be that the I/O was on the rear, but ill cut whatever anyone wanted of me.
One issue that is not so easy is the card slot. That is not easy to DIY neatly. A way around this would be to cut the case roughy, and then fit a nice overlay to the back that covered the rough hand cuts.
I do not have one of the moog cases, nor a functional mbeq, so, whilst i could check the top panel, it would be hard for me to confirm the rear.