Seems (looks) interesting but I'd think there would be an
awful lot of play in a system like that. If it were me I'd
consider and inverted pin router. Search the Lee Valley
site for their over arm or do a search on Onsrud Inverted
Not saying you need an Onsrud but the principle being the
router is locked down solid into a table and the arm doesn't
quite need to be a stiff (solid) as the "old style" over arm
Your Mileage May Vary but I still can't see how they (the
link above) can get things stiff enough.
IIRC, one of Patrick Spielman's books has plans for an overhead router
arm like the one pictured; I don't remember which one.
DAGS in this group on "router jigs"; I couldn't recall Spielman's name
and did a search on "router books" to find it. Some such search would
turn up a wealth of ideas.
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