With the 520 Table and Pro Fence system you have a couple of options for outfeed tables that can move with the setup. The first is shown below and is a modified version of the outfeed table Shopsmith used to sell. The leg has been changed to attach to the bottom of the Table tube. This setup moves not only up and down with the table height but also tilts with the table.
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The Mark V 520 (and the 510) can use the Floating Tables for both infeed and outfeed extensions. Shopsmith sells brackets for direct alignment or you can use them offset without the brackets. The picture below shows the Brackets part number 555997 in use as an infeed table. These two methods do require adjusting the support leg's height with the table height. The more Floating Tables you have the more infeed/outfeed options you have.
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below is the brackets themselves.
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The Sawsmith 2000 does have that sliding blade feature, but the blade does lock in place for regular table saw cuts. The Sawsmith 2000 was made from January 1985 until sometime after November 1993. I don't know exactly when it was discontinued. Parts must be found used for it. There were 4 models varying in the fence and table width.
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