5x10 conventional layout wiring advice

No. The two front sidings are an added 12" I can't make the entire layout 72" because it would interfere with a bedroom door. I also can't go longer than 10' because there's a closet door on the opposite wall. I'll mount the switch controls and transformer under the front sidings. The layout was designed in SCARM which is free and easy to use once you read the tutorials. 

Thanks John. I watched the Lionel video on transformer phasing and fortunately I own the exact same three transformers so that all makes good sense. Would I connect one transformer to the outer loop and the other to the inner loop and then use blocks at the connecting switches? The Lionel video on blocks focused more on sidings and didn't discuss powering two connected loops so I'm still a bit fuzzy on that part. Will there be a problem if one throttle is set at say 30% and the other is at 50% and the train goes from one loop to the other (other than a change in speed)?  

I started with 22 awg solid and thought I was pretty smart. Then got some cheaply made wired rail joiners for my Atlas track on eBay and used them as drops all over the layout. I am now paying for the latter mistake especially in the "valley of death"  036 to 054 to 054 to 036 Atlas switches in series.

Take your time and plan using good quality items. My layout is small so 18 awg is stout enough and easy to work with.

In addition to phasing your transformers, try to keep the voltage of both near the same rate when crossing the gap or insulated pin in the crossover. It helps to have some inexpensive 0-25 range AC Panel Voltmeters, one for each power district. Available from Light Object for around $10 each. 

They also have 0-15 amp range panel AC amp meters for about $10.

I assume you plan to operate in Conventional mode.  If in Command Control you have no problem since both districts are at a fixed 18 VAC.

Well I finished running wires this weekend and got my CW-80 connected. More feeders and stouter wire made a HUGE difference. I'm able to crawl my locomotives around the entire layout which will make positioning them next to operating accessories a whole lot easier. Only problem I'm having is there is one spot where my largest locomotive, a MTH GP 45, will die if I try to run it through at a walking pace. It's fine at a faster speed and the problem appears to be that the front roller touches the plastic parts of the crossover at the exact same time the rear roller is touching the plastic surrounding the magnet on the uncoupling track. Without enough momentum it stalls out and needs a manual nudgel Going to swap the order of the uncoupling track and the 1 3/8" connector and see if that solves the problem. 

I also still need to take a Dremel tool and cut a slot in the middle rail of the 5" piece between the outer loop and the crossover in the front left corner and then also pull the connector on the 1 3/8" piece between the two O72 switches at the top so I'll have the two loops as blocks and then hook up my second transformer in phase and be able to run two trains at once. 

Thanks again for the advice!!