I routed the brown RG-400 coax for the VOR/GS/LOC antenna on top of the vertical stabilizer down through the stab, made a quick 2-coil service loop and then up through the fuselage bulkheads to the rear of the instrument panel. The bushings in the vertical stab are just large enough for the BNC connector to slip through so the stab can be removed without having to cut the cable.
I found this really sweet line of weather-proof multi-wire connectors on the ACS web site and plan to use them for the wing/fuselage and tail/fuselage connections. They have these little rubber inserts that go around the pins and seal everything up nicely. They look kind of big and bulky, but they are actually really light. The peace of mind not worrying about the connection will be worth the slight bulky-ness.
I ran the 5-conductor cable for the pitch trim motor and sensor along the same route as the VOR coax through the fuselage. Made a 1/4" hole in the elevator spar and popped in a plastic bushing, soldered all the wires, and then stuffed it all up into the elevator. Works great!