Grand Staircase - Central Staircase

I've built the central staircase first. The reason is that this is the piece that will be used in multiple configurations. Therfore I'll use it to to make sure that it is working with the other pieces the way I expect it to.

Something I haven't mention is that I haven't attached the railings to the any of the pieces. I plan to do that once I have them all built.