I always liked that layout design.
I wired my turnouts, but mine are not power routing. You could get away with wiring all the sections around the turnout.
You know of course you have a reverse loop.
Also, FYI: here is a presentation from the 2005 NMRA Convention that specifically uses this layout to explain how you can have operations on a 4 x 8.
Edit: Oops!
Starting Ops on a 4 x 8