Center Console?
 

Has anyone ever built a center console for there jeep?
Mine is an 88, and I was thinking I might try to build one with baltic birch plywood, so that I could include a cup holder.

I haven't built a whole console, but I did modify an aftermarket cup holder that mounts to the top of the console compartment to mount it on the side. I added a little to it with aluminum flat bar to allow it to accept just about anything up to a one litter pop bottle
https://cimg8.ibsrv.net/gimg/www.che...f9d61b1feb.jpg
https://cimg9.ibsrv.net/gimg/www.che...b86cdfbefd.jpg

If it's just a cup holder you're after there are several threads here that provide options. If it helps this is how I did it for my '89. Shown below before paint ...

https://cimg7.ibsrv.net/gimg/www.che...a28e4b427d.jpg
https://cimg6.ibsrv.net/gimg/www.che...b708b1d868.jpg