Hey Matt
first off, really really great job, its soooooo damn nice there!
on the MCU/XT/XT front, what DAW are you using? i had the same setup as you did with the MCU and extenders and swapped out for a mixed logic M24
Mixed Logic
you can email kevin borroman there and he is a great guy
i run sonar and cubase and its a great controller for those DAW's, and IMHO much better built and supported
anyway, just an idea if you were looking to switch
although the new euphonix stuff also looks good
best of luck to you!