Very Interesting, but the sawdust is going to get on the threads. Could you mount the screw on the underside and use a "U" shaped bracket to connect the screw to the fence?
Table saw fence and guide
Build in 'Furniture Builds' published by Marc Gingras, May 5, 2017.
The idea was to build a proof of concept table saw fence similar to a thru-rip or accusquare fences which retail for 400$, with the added option to motorize the positioning.