Hey Spud,
Ya just beat me to it. Yessir, the lines are a separate scenery item to be added to your scenery library just like any other RTMM scenery. I've attached them to this post if anyone wants to take a look. There's 400ft marked now, with distances labeled (in feet).
These are painted on runway 20 at PANT (Annette Island). I designed them to fit with the "Annette Island Fly In" scenery, but they work just as well without that scenery loaded, as long as you're running ORBX PFJ.
Video demo to follow, but maybe not until tomorrow sometime.