Russ:
I've got the Robland X31 - with that sliding table. How different the set up is as an Add On I have no idea. But here's how to adjust it on the X31.
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eccentric bearings under the sliding table are "not obvious" adjustments that let you tune the sliding table's angle relative to the saw table top. So go over this page and the next page about them.
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X31 has a dovetail miter slot which allows things to be secured to the saw table, unlike US market "rectangular" miter slots. There's a jig for aiding the set up of the sliding table which uses this attachment method. Here's the url to the "modified rail jigs"
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jigs don't set the table (co-planer with the saw table top, tracking parallel to the miter slot) - but they do make things a LOT easier - the sliding table table is pretty heavy and not balanced on the rails so it wants to tip over.
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sure if these jigs will work on an Inca.
If I can be of further assistance feel free to e-mail me.
charlie b