So as the title suggests, I've got a set I'm building right now. So far what I have is:
Gates: Lengths from 12' to 36' (6' increments), with US&S, Griswold, and Safetran(planned) mechanisms.
Flashers: 8x20", 12x20" and 12x24" with incandescent and LED lights of a generic design. There are also 8" Griswold flashers.
Accesories: Signs are mostly done, as are bells (a couple look a little off), and some other little things remain to be done:
Cantilevers: About half a dozen designs are done. I'll probably do a couple lengths for those, and a few others that are planned. If you have a specific type you want in the final set, let me know and I'll see what can be done.
Here's what they look like for now (click to enlarge):