Pierre is right on. If you want to have a vor ant "cat whiskers" on top of vs, now is the time to run the rg-400 or conduit to run it through later. I installed mine on the bottom of tailcone and it works fine, but is a safety hazard for eyes.
When starting tailcone, plan for these possibilities...nav/strobe wires, vor coax, strobe power supply bracket(vans), elt bracket(vans), ahrs bracket(vans), aux battery mount(fab myself), ss seat belt cables/hardware instead of steel, pitch trim 5 cond cable, pitch ap servo bracket, vans pop rivet static ports(they work just fine) and fabricate magnetometer shelf. That is all I can think of right now. It cost more and takes more time now, but I only spent 2 hours or so crammed in my tailcone mostly riveting. I did all the rest from outside. I would have damaged something on me or the tailcone if I had waited until later.
Oh, I used SEM self etching primer from autobody store on anything not alclad or where vans recommended or where I thought moisture may accumulate later. Don't prime the trailing edge wedges as you want a strong proseal bond with these. You can use an alodine kit on them after machine csk operation. You do want to prime all angle...angle stock is used on each side of tailcone running fore-aft. You'll need a big vice and hammer for bending these. Have fun building!
There are several -10's in your state. Look in the rv white pages to the left and post on here for a ride. You will find that some minor modifications and accessories are nice/necessary, but most are not. I built to fly, not to just be building. Some will say not to do that, but I have built things with my hands my entire life. It was just like building a house...cost, planning and all. Now, flying with the family...two trips and getting more comfortable. Planning a trip to the SW in June or July.