Upfitter accessories tend to be kind of expensive, even used. I'd pull that base, sell it, and replace it with a factory console. They come with, or you can get, cupholders that fit in the front 'cubby'. Heck, you can get a couple of them, and have space for your water, coffee, tea and Coke all at once!
We have one in our '10, and inside the console hide a pistol vault, Antigravity jumpstart battery and still have room for much, much more. The console makes a handy arm rest, too.
Look around the passenger-side footwell close to the transmission tunnel for three holes. That truck may have had a laptop mount mounted, and if so, would still have those holes. You can get a similar mount with a flat surface to use as your 'table top'. Again, they're not cheap, but if the bolt holes are already there, use them.