Word of advice, do the control panels last, or you will never finish.
I "finished" my cab with a horizontal monitor, then decided that I wasn't completely happy with the swappable CPs, so I went modular.
I also wasn't happy with the monitor in it because my wife didn't want me to "tear apart" the brand-new 21" PC monitor I bought for it, so I mounted it with the case intact.
I recently decided to make it a dedicated vertical cab, bought a 19", decased it, and mounted it vertically.
I just got a 29" monitor for my "next" project, but haven't done anything other than hook it up to use with my standalone controllers yet.