I still hate the cheap hollow aluminum table that came on my little CNC
Router. If I were going to use it solely for wood working (and I might) I
would probably throw an MDF table top on it, and forget about, but
occasionally the Taig and the MaxNC are busy and I need to do some small
project in aluminum, so a wood table would suffer from oil and/or other
coolants.

I considered one of those aluminum t-slot tables on ebay, but they aren't
all that thick. I considered making my own out of aluminum thicker, but
there isn't much Z travel on this machine to begin with.

Cast iron seemed like a good idea, but the stuff is expensive domestically.
I'm not sure we have many foundries left to cast it here.

Then I had a thought... why not order a replacement table for a desk top
mill. Its already mostly machined, and pretty square and parallel. Just
flip it upside down on the big mill and cut a couple slots on the bottom to
fit on the base of the router. Don't even have to remove any of the rest of
the bottom machining as long as it clears the ball screw for the gantry.
Two of them off a G0704 would give me a 4" overhang on the front for
mounting a 4th axis drive and still have most of the machine envelope clear
for other work. The G0704 tables are listed as replaceable parts for a
little over 200 each. That's no more than a similar area solid aluminum
table, and a heck of a lot more rigid. Seems like it would work with very
little machining from crate to use. So what obvious better solution am I
missing?