I know, I know, it's just plumbing! But it's not just any plumbing! I'm so glad this part is done. Took all day with me as the plumber's helper to install the hot/cold supply, drain, and venting. Looks so simple when just looking at it, but it was a job indeed.
Next will be installation of the faucet, just the basic hot/cold unregulated faucet for now, will be installing a regulated one later.