Hi Paul
I would pass on the Cast Iron top,,,Today I had to drill a hole or two for the box jig that Oak-Parks sells and I use it all the time and with my luck the holes would need to be in the web support casting on the back side of the cast iron table top.
As you know that can screw your day up, I'm always making jigs to make the job go quicker and to do the same thing over and over, most don't bolt to the router table top but some do...
Have good one mate
Bj
