There is a gentleman on the SmokStak forum who recently found/got a very nice small table engine. You should be able to view his post and his pictures at; [http://www.smokstak.com/forum/showthread.php?t=74004
I really like this engine, and it has several intresting items that would translate well to a model of a table engine. In particular, the crank being made as it is with the subsantial square shape would be easy, and the steam chest being made as a seperate piece from the cylinder and being bolted on to the cylinder at the top and bottom would be easy to do. I also like the crosshead guide rods at the top of the cylinder, and can visualize making them from hex stock, turned round except for a very short section at the point where they screw into the cylinder.
If anyone on this forum recognizes this engine, the original poster on SmokStak is looking for information.