Ok, my setup isn’t as cool as some of those I see here, (@SteveCarmichael that is so cool) but its heavy and will fit my 1000mm x 610mm X-Carve perfectly, just as soon as the parts come in 
There is a lot of electronics/mechanical/military surplus here in San Diego so I generally try to recycle and reuse as much as I can. The table top is a surplus Melles Griot optical bench and it weighs about 90 lbs by itself. The holes on the top are all 1/4-20 and will come in handy I’m sure.
The table was in fairly rough shape when I got it and I still have some finishing work to do on it. I spent some time sanding, cleaning, and priming the top. I still need to finish sanding and then a final coat of black to finish it up.
-John