Benchwork and subroadbed is complete from the helix through the opposite corner. The benchwork is homasote over 3/4" plywood that rest on 1x3 stringers supported by shelf hangers.
I decided to go with homasote for the top deck everywhere for a couple of reasons; I was so happy with the performance on the main level in Acca yard that I wanted that same experience on the upper level. If I was going to rebuild the railroad, I would put homasote everywhere and not fool around with the woodland scenics foam roadbed.
The homasote gives a few advantages over straight plywood; it is easy to elevate the main over passing tracks and spurs with cork roadbed. The cork can be sanded down to give a nice ramp to the flat(ish) homasote. It takes spikes wonderfully, which means it is faster to lay track than gluing with caulk and if you find a mistake, it is easy to correct after the fact.
Bus wires were run before the benchwork was laid down and fastened; much easier than trying to fish solid core 12AWG wire through the tiny space that would remain.
A couple of pictures to illustrate the updates follow.
|At about mid point in the yard, we look right down the line of supports and bus wires.|
|Plywood down and test fitting in progress|
|This give a good visual of the area available for bus wires, switch machines, etc.|
|Lots of wire... Have to have it for block detection.|