It's in the project bin. I'm collecting materials for it, but am fully engaged in finishing the scratch-built Victorian train station that I'm doing a detailed description of in the "Continuing Saga of the P & PRR" build thread.
In fact, I just resurrected old plans from a 1950s era Model Railroader for a small substation that I scaled up to O and am using as an alternative to the switch yard support structures. It's all made of channel and angle, no H or I beams, so it could be less $$$ to build.
Much to my dismay, scratch-building is not necessarily cheaper than buying kits. In fact, it can be equal to or more expensive. When you start adding up the piece count of all the bits and pieces, it quickly gets to $100 or higher. But it enables you to control what you want on the layout.
