Thank you! I hadn't done threading before, so I got a tap and die set and made a bunch of #6 SAE threads in the T Track. I was a bit nervous if this would work but it ended up great without much trouble. I also decided to epoxy the T Track into place, more for piece of mind than anything.
Used #6 3/8" flathead screws up from the bottom into the track.
The router lift is now set up and feels very sturdy. I contracted a local commercial woodworker with a nice CNC setup (
Liberating Wood) to cut the top pieces for the workbench out of baltic birch. They've turned out very nicely!
The start/stop switch is
this model from Rockler. I did a surface mount for the switch on the side face, as it is in the plans. This version protruded further than the side of the table top, which I could envision getting accidentally tripped into stopping. So I added some extra width to the router table top to help prevent this.
Here's the current progress.
Next will be the top drawer to support the sliding carriage, the slides are in route.