I have installed Mk3 and after initial confusion and disappointing results it works great!. Peace of advice for all: flash latest firmware, it made huge quality improvements for me. Also, after choosing one VGA mode for all and a little bit of fiddling between live configs and a tool to save them I am happy as a pup.
However, I have removed my RF module and used this spot to install monitor connection. I had to trim a PCB a little but outcome is AWESOME! I think that you should consider making it a bit narrower and a little bit reshaped to make it an easy job for everyone. (I am using space beneath FDD for my CF card adapter to be accessible w/o opening the case)