Post back with pics when it's done! Of all the trucks I've owned, my F150 is one of the easier vehicles to install accessories in. You shouldn't have any trouble getting the power and coax up into the cabin.
I don't know if you ever found an answer, but I typically use a grommet behind the passenger side fender liner (behind front wheel). It goes into the vehicle body behind the fuse box (but you don't have to remove it). I found it referenced in one of the Explorer upfit guides.