For you guys looking for a cheap cocktail table alternative. The suck gate suction cups would work for a great mounting system.
Unfortunately my first attempt at a suck gate failed as the suction cup handle (HOD) that I tried the first time didn't hold well enough, but no use letting that first handle go to waste.
My first suck gate failed as a suck gate but I did stick it to the side of the cockpit below the seat long enough to make a sandwich and pour a drink on it as I contemplated the changes for the next version.
Just turning the suction cup handle so both suction cups run horizontal to the floor, add a couple pieces of flat iron between the two suction cups, mount a couple L brackets to the flat iron coming up from the handle, bolt on a cocktail table top of your choosing and you should be good to go.
I think you guys in need of a cocktail table should have a budget solution for under $40.
You could always get fancy and drill a few holes to hold a go cup, shooter glass, or install a couple chrome drink holders to hold beer cans or a beverage of your choosing.
I was lucky enough to get a cocktail table with my boat when I bought it, but it is stationary in the back corner of the boat.
The cocktail table sucker would be portable and could easily be moved around the boat.