There's a type of table post that locks in place and is not recessed into your floor. Only sticks up about 1/2" above the finished floor and locks in tightly...no big flange like the one pictured on the bottom of the table. Then, follow KOV's thoughts above!
They have two kinds of bases, the raised one and also a flush one you do have to cut a hole in the floor for the flush one obviously but if you have a raised wood floor it's not a problem. Google is your friend
Dinette table that hinges up and can be removed then. Single leg folds. We leave it in place but can remove it. Cost was about $30 for the folding led and wall bracket. The rest was scrap from the build.
No need to make your own. Home Depot sells hardwood glue up tables in various sizes. Rectangle and round. The small round is less than $10. As for the base just get the cheapest pedestal base on Amazon. They all work great.
We are planning a removable pedestal table that uses the swivel seats, both turned aft at ~135 degrees. We'll also extend the cab floor level a bit, similar to RD's. Anyone have that configuration? Does it work OK? Leg room, getting up to fetch things, etc?