Help me remove kitchen sink cabinet plumbing
You don't mention what type of floor you're demoing, but if you don't care about the cabinet and don't mind wrecking it, why not just take a Sawzall or a jig saw and cut the whole bottom out? Of course, you'll still need to deal with the plumbing eventually when you're ready to remove it permanently. But this way you get access to the flooring now, and when you're ready to replace the cabinet you don't need to worry about trying to keep the whole setup working. Then it's just a matter of turning off the water, cutting what ever is in the way, pulling the old one, installing the new, and reconnecting the plumbing.