I would think it likely Electric Railroad, Dalee, or others could supply a board to use as an interface with near any servo control board. They might even offer something that would control servos themselves. Servos are pretty standardized, only a few options really. Their servos may only be 170° but others can be continuous (360°). I only scanned the text,but it also seems that controller might only offer one door at a time movement too. (which would be even cooler in a way, except for explaining the "ghost". Synchronized operation, you might glue a figure to each door? Oh they also appear to be ac/dc ready. (not a biggie, but that much less work.
The price and shipping? Note that sites ph# was not North America.
Wikipedia used to have a good servo page also.
Finally, to get Stan's, GGG, GRJ's attention, electrical may be a better spot to post. (ask to be moved if they don't catch this. I don't know if you can edit it yourself to move it or not?)
