That is a big one, the Big Boy that is! Wonder how MTH got it down to the 0-54 curves? Anyway, I bet there is some serious overhang with that rascal, even on all 0-72 curves. I was starting to feel bad about suggesting the 0-54 stuff earlier. But, one can only do so much with a given amount of space and I think you have done quite well fitting all this together here.
It always seems like our layouts are either too small, too expensive or too time consuming, or all that in one! There's probably more that I missed... 
I wonder if too large could also be a problem, if one had all the resources necessary for it that is? (And a very large crew of expert craftspeople to build it, of course. 
)
