Did four things:
1) Drilled and tapped holes for Adel clamps for wiring runs on 1.8 inch aluminum radio panel.
2) Connected power and grounds to XPDR, COMM and GPS
3) Mounted ADC and Flightview Pro close to exterior door. GPS receiver antennas will exit through a hole to daylight.
4) Analyzed RF cable, connector and antenna mounting requirements:
XPDR
Separation 3 feet from COMM antenna
Ground Plane 120mm
COAX RG400 or RG393

COMM
Separation 12 inches
Ground Plane 1 metre square
COAX RG400 or RG142B