[Splat]

It'd be a great amount of effort and re-planning (I wish I'd made it one block wider so it'd be an odd number, but I can't be bothered to remake the corners even one block).
It doesn't matter that much; unless you can really shrink it (which I know is impossible in Minecraft's limits) it's not gonna fit inside the building. However, having it outside, visible from one or two of the tracks, would be cool. And in that case, size isn't a problem at all.