sink

Hi all, I'm trying to remove an old leaky kitchen faucet for a friend, but I've run into an issue trying to figure out how to get the retaining nuts off from under the sink. Please see attached pics. The issue is that I'm unable to unscrew these triangular retaining "nuts" because I can't get...

Does this meet code? Any recommendations? I bought a new vanity and I don't want to cut through the little shelf to have a regular P-trap. This gives me a trap, but the darn thing seems to leak where the downpipe inserts into the forged metal collar that accommodates the pop-up mechanism for...