This router table is meant to be clamped to the corner of a bench for occasional use.
There's no doubt that router tables are a useful thing, but I don't need one enough to justify the space they take up. My shop is small, and every bit of space is precious. My compromise is this relatively thin router table that I can clamp to the bench when I need it, and tuck away in a corner when I don't.
It's a bit primitive: the fence is just a single pivot point, there's no t-slot for a miter gauge, no dust collection, and changing the height is slightly awkward. For me, those are reasonable compromises. I may improve the fence someday, but this is certainly good enough for my current needs.
Construction here was done with dominos and glue. There's no good reason this couldn't be accomplished with conventional screws and glue, though, and I think either method would result in something strong enough to support the router and the workpiece hanging off the edge of the bench. Exact dimensions aren't really critical, but the dimensions of the one shown here are 32" x 16" x 3".