Piggybacking a bit on my thread a week or so ago about using a Triton router in a table. My current "router table" is a wing of my table saw that was built out of MDF laminated with a matte Formica, with a plastic router plate of some sort, I don't remember the material or where I got it. Over the years the table has sagged a little bit out of plane with the table saw top, and has also dished a little bit, which makes routing consistent dimensions particularly challenging.
What do you all suggest for material? This will be DIY - I am not buying a phenolic or cast iron table, as much as they appeal to me. I'll probably use one of the Rockler or Kreg plates, but I need suggestions on materials. I'm leaning toward a couple of layers of Baltic birch, with some hardwood "ribs" glued and screwed to the bottom for stiffness. Or, some kind of torsion box for a lightweight version? Whatever I use will be incorporated into a stand-alone table/cabinet and not reinstalled on my table saw, I'm going to rebuild the wing without the router insert.