I finally took a drill to some plastic and have started positioning buttons!
I was hoping to get 10 buttons on this footswitch; 8 for pure effect assignment and 2 for cycling pedalboards. Its just going to be a bit tight to be feasible with foot use.
No problem through- I have loads of the panels I've drilled, so I can just drill some more and swap them out.
I'll explore using three footswitches along the bottom, three along the top and adding some code to allow holding the button to allow extra presses.
Once happy I'll wire the buttons up and attached them to my arduino Due and build the rest of the enclosure around it.