Thanks so much, everybody! As for whether I've done steam models before, I have not. I've been trying to figure out how steam boilers and engines work for a non-model related work project, and it got me itching to use the info in a model. There are still a few things with the wheel part especially that wouldn't, as far as I can tell, technically work; I still don't understand the hydraulic bits. But I think it works for this.
I was trying to figure out what would go in the bridge, and from looking at movies and a few photos, it seems like most didn't have much more than a wheel. Any suggestions for other tidbits of import? I think I'll throw in a small stove for coffee, Jerry-rigged in.