John & Juan:
Your EMI problems certainly do present considerable difficulties. Your suggestions of placing connectors on multiple faces of a module run counter to the whole module mounting plan for Eagle. The modules are mounted with only about 1.5mm clearance at the flanges and only about 16mm clearance on the sides. The "rear end" of the module is also difficult as there is just not that much space for cabling and connector access. Mechanical designers in the past have been raked over the coals for not providing sufficient connector access. The curren plan allows about 100mm (I don't have the drawings with me at the moment) of space between facing columns of modules for the cabling and connector access. This is a plan that is pretty basic to the whole wiring plan for Eagle, and it is a result of a lot of experience with P3D.
While the basic module design for Eagle, unlike P3D, does not provide for the stacking of modules, a small CAN module placed on top of the URx, could be considered. Wiring to this sub-module would be by means of jumper leads from its connector face into the URx.
I caution that there currently is not planned for much space above the rows of modules as the current spaceframe plan has the modules placed fairly closely under the solar panels. This concept is part of the need to keep the mass moment of inertia, Izz, high. This is NOT just a desirable feature, but a necessary, MUST need for the spin stability of the spacecraft. So any top-mounted sub-module would have to not be very thick.
All of these issues arise from the practical considerations of the overall mission of the spacecraft. Unfortunately for the EMI and other "local" issues, we cannot design the spaceframe only for EMI, but must solve other mission requirements, too.
I am not trying to be unmovable on the design if the URx, but I am trying to explain how we can have a successful mission.
'73, Dick, KD1K