It is good to keep looking at the entire layout as it progresses, you sometimes get a better idea when you see things in real life 3d than scarm images. Scarm is really a great program, but I for one have trouble envisioning how the layout will really appear and function with all the scenery completed, buildings built and scenes set. I am sure I will be going through the same as you are, or at least I hope I will. I have just about completed the control panel, waiting on PSX circuit breakers. At this point I have three power districts set up from one TIU, three AIU's with micro controller wired to provide wireless connection to block relays and turnouts. Also have three barking watchdogs with a ton of help from GunrunnerJohn and his thread. It will be powered by one Lionel ZW transformer, which I hope can handle the track power requirements. I'll have other supplies for accessories, building lighting etc. I'll snap a pic when I get the circuit breakers on. I have been reading about these circuit breakers and I am not sure at what trip current I should set them at and how to set them for heavier loads >10amp . Not sure if I will need >8amp setting which is done by jumpers. I search around this forum to see if I can find this information. I am sure it was talked about somewhere. 
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