How to create or add bus wires to small layout?

[ezdays]

My N scale layout is just about the same size as yours. I don't have a power bus, rather, I did what's called a "home run", where I brought each block to one location and used insulated rail joiners to separate the blocks. I tied them all together while I was testing, then brought them to individual switches for block control. A #22 gauge wire can handle up to one amp and even a few feet of wire won't have that much voltage drop even with a couple of N scale engines running.

But Wayne is right, I've never agreed with the power bus thing either if you have good connections all around. If you're not using blocks, you can still add wires every few feet if you choose to and home run them to one point, no power bus required.