I realized the issue with the motherboard.
There is a nice ZOTAC one which can fit it (mITX).
Still I think I will take a bigger case as you suggested.
I thought on Lian-Li PC-V351
Any comment on the this case?
And about the motherboard, it could be that I still go on the ZOTAC H67-ITX WiFi
mITX since it has both integrated WIFI and USB3 in it.
What do you think?