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Dont't know if this would be useful to you, but I've fiddled around with the Atlas turntable a bit, and think that it could be modified to serve as a drive for a larger turntable.  I think a drive shaft could be made to replace the bolt/nut assembly in the middle of the original turntable., locating the Atlas mechanism under the table/pit.  You'd need to figure a way to power the track on the larger turn table as it would be difficult to use the original atlas spring plunger system.  The main down sides are that the movement is unrealistic, and the atlas motor drive tends to be on the noisy side.  There also has been some play in some of the units I've experimented with, resulting in inaccurate indexing.  Since they were second hand, it could be they were worn or damaged.The plus side is that you can pick used units up at train shows and swapmeets dirt cheap.  The last one I bought complete with motor set me back $10.  And you're right, the Geneva mechanism is great fun to watch operate!JBB
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