I spent some time inspecting and running new Atlas O 53'Well cars. All the track power blocks are installed under the table with a reach of less than four feet to the nearest MTH 1014 Terminal Block. I used 35 for track power, wired in a circle under the mainline and to the ZW-L transformer. It was an expense that has proven valuable when trying the trace a wire. (I am not having to chase 28-feet to the transformer trying to separate out one wire among hundreds.) The reduce power run-lengths saved wire costs that helped pay for the MTH 1014 Terminal Blocks. (The small 4' by 4' block areas allow me to see all wires for that one small area.)
I am running another power loop to the Atlas O Signals, off a different transformer handle. Buildings will use the Woodland Scenics LED wiring system. Distinct wiring systems make it easier to know what wires I am working on.
I stated the layout quickly in mid-October, 2015. Two months were spent building the custom table. Two more months were spent laying and re-laying track to get the rough appearance of my original track sketch. (Modifications had to be made.) Then I started running trains, rather than finishing the layout. How time slipped away... A little work one day, a lot of running trains the next.