Re: P-Rail orientation
Yes much thought was given to this, and the Rails to the inside is the most likely orientation (likely 90%) and that is what the logos suggest. I'm pretty sure (but not positive) that you can order "reverse logo" versions as Shop Floor Customs if necessary. Our standard orientation yields the best "quack" from the Rails in an H/H guitar, and it pushes the P90's up against the fretboard and bridge, where they would be if the guitar were routed for P90's.
The P90's are nearly centered. That means if you flip the P-Rails, the P90 tone changes only slightly. But the Rails tone changes dramatically, and therefore the Humbucker tone changes too. On an H/S/H guitar I still like the Rails on the inside. They're close to the middle single, but they get a really great Strat quack when used with a middle single coil. I've got an H/S/S guitar with a P-Rails and I have it oriented the normal way. I also like the Bridge P90 combined with the middle single coil to simulate a "hot strat bridge/vintage middle combo.
Definitely don't be afraid to flip them around. I'll probably have one guitar H/S/H guitar loaded with flipped P-Rails.
Now, a Tele with a neck humbucker is a GREAT place to flip the P-Rails. The Rail coil will be up against the fretboard like a Tele neck pickup.