I have confirmed that the matrix labeling is correct with another user. I might change a few things on the rear panel, not sure how much space I have to work in my ideas may design a separate break out box. Would like to have more I/O for the filter Input and a active mixer for all the channels. Maybe get buffers for the in and out? The feedback hack is cool so would like to keep it.
Here is the final panel that I am going to go with. I will post up the DXF and a gurber version when I make sure it all fits.