$2500 for cabinetry to your powder room seems a bit high ...but cabinetry is always expensive. Definitely query it though. We flagged lots of things we thought they had over quoted on and they came back to us with lower prices on a few things.
hobless showers cost more, we were charged around 900 for both bathrooms. This cost is due to needing a reflux valve to stop prevent dirty water coming back up into your house. One valve does both bathrooms.