It looks like we are both at about the same point in layout construction. I've got a 28x8 layout with a 10.5x4 extension built on Mianne benchwork and most of the track down (still not sure about some sidings).
I'm in the final stages of wiring. I have 3 separate lines being powered by a ZW-L using the AU, DU, & BU to control the power districts. The CU control is being used for the block controller and accessories. I have 12 separate blocks with power and common drops every 10 feet or so but at least 2 drops per block. Common is bare copper, although I'm not completely sure it will work with the Legacy controller yet. I'll find out tomorrow.
To make my life easier, I used different color wires for each block and am very glad I did that. I used a resistance soldering iron to connect the drops to the track and then suitcase connectors to connect the drops to the block wires.
One thing you probably can't do is use the Z4000 to power the Tortoise machines. I'm pretty sure they require DC. I had them on a previous layout 25 years ago but am using dz-2500 switch machines for this layout. On the previous layout, I used old phone company relays to transfer power from the micro-switches on the panel board. With the remote control systems, that shouldn't be necessary anymore.
I do use a surge protector but the ZW-L has pretty robust protection built in against shorts. However, I don't think you can overprotect your circuits.
Let us know how things progress.
