Your yard has "switch overkill". In the real world, this would be called the "bowl" of the yard, and these tracks split off one or two mains, but they don't normally have crossovers between them. Eliminating the inner switches will give you more space to store cars without fouling anything.
Also, make sure your turntable is long enough for your Big Boy. One thing that limited the operating area of the real engines was that only a few turntables could handle them.
I assume that rectangular building with the two tracks coming out of it is your backshop. It might make more sense to eliminate that diamond and switch, lengthen the approach, and enter it off a turntable lead.
