Took the plunge and installed the transponder and comm antennas. Decided to mount them under the pilot's and copilot's seat pan. Makes for a short run to the panel. Also ran the SV cable to the ADHRS in the rear of the airplane . Not exactly sure how to route the cable, Checked to see if I can get the SV cable and two coax cables thru one snap bushing. May have to install Vans corrugated tubing after all since it has a larger inner diameter.