I believe the '10 and '14 wings are pretty similar. I just finished one of the outboard bottom skins of my '10.
Vans' tubing is extremely flexible. Honestly, I can't imagine putting it in with the skins on. It was pain enough getting it through the short section of the bottom skin that had already been done. It was reasonably easy to work around with it already installed. Plus, you probably want to put some proseal or RTV around it at the rib holes so they don't eat through the tubing over time. Can't imagine doing that with the skins on!
My vote would be install the tube, cut the appropriate holes for wiring, pull strings for the eventual wiring pulls and then rivet on!