Nice build there mate
Mini itx so underrated as always.

some great parts used.
I was using the same noctua cooler when I had z87 setup. I managed 4.4ghz overclock on this little thing in a coolermaster 120 case. Excellent little thing.
I am sure 4.2ghz could be a comfortable oc in that case.
Since upgraded to the MSI Z97i gaming ac board too

, and I've got a really nice clock of 4.6ghz on my 4670k. Though must say I changed the case to a corsair 250D as we'll.
Love to see some more pics