Question If the GFX01 is rack mounted is it still possible to plug the expression pedals into the floor unit or would I need cables running to the rack

If the GFX01 is rack mounted, there are 2 extra pedal inputs in the board which are accessible only when the rack unit is removed. So you do not need long cables. On the other hand you can still use the pedal inputs of the racks, which brings the number of available inputs to 4.