Thank you, Bob, Rubin!
Bob, that is a good question. There are several small areas that need finished before the Golden Spike is driven!
The first photograph shows I need to replace the mocked-up roadbed on the start of the far wall down ramp. I was using some of the ramp I used for the downgrade that was against the wall. Once a roadbed is in, I just need to cut one track section to length and it is done.
The upper left corner of this drawing shows how it will look. (Upper Loop Drawing)
Here I laid out a #4 switch and track on top of the track to get rid of the 042 switches that cause a bad S curve on the new lower loop. I will then extend the tail track of the new curved yard around where the 042 switches are. That is a bit of work.
The upper left corner of this drawing shows how it will look. (Lower Loop Drawing)
Last, I need to finish the passing siding on the opposite side of the room. That won't take much either.
Rubin, I decided to use the area under the pivot points of the bridges for back to back power boards. I chose this location because I thought it was close to the most track switches and track power blocks for a minimum of wiring. It kind of grew beyond what I ever expected! 
This side has the Z4000, TIU, PSX-AC1 fast acting circuit breaker boards at the top, and GunrunnerJohn watchdog signal boards to the left.
On the reverse side of the board are 3 AIUs, 10-volt solid state relay boards, terminal blocks and two radios to listen to Pittsburgh Pirates games. (the portable radio in the front is easy to take outside working in the yard, but the older brown radio in the back gives better reception) The MRC power pack is providing power to the linear actuators for the bridges and something else which now escapes my mind!! 
