Agreed that it would need a big budget except for someone who can scratchbuild all their own trackwork. But, like a lot of city stations, it is quite compact. I have not tried drawing it yet but I am fairly sure that an N gauge modeller could get it to fit in a standard 16' x 8' garage.
The plan is also shown in detail in one of the Historical Surveys of the LMS books. Signalling was awesome. How a driver could identify which signal he needed, I don't know.