As I said, I purchased my setup from Rockler, but I think it's pretty
similar to a setup sold by Woodpeckers.

They offer a router table (similar size and construction -- MDF) with a
metal stand.

And they show the top being attached to the stand with "deep thread
screws".

If you visit this URL, look at the far right column, third photo from
the top --

http://www.woodpeck.com/legs.html

Do you think that's all I need?? :-)