Here is what I am building. I want something kid friendly (hence the three main lines). But I also want to be able to have a small yard. There are two access points near the 90 degree crossover. This was designed on AnyRail with Gargraves flex track and Ross switches. It's 11' x 11' with that lower right approximate 5'x5' section taken out. There are two O54/O31 turnouts as part of it. I'm hoping that since it opens up after the O31's that I will not have issue running a steam engine with O42 requirements.
Time will tell.