Guest Room = Study / Library & its bath = powder bath w/ larger Study storage closet. Open Kid's Nook, Laundry, Safe Room into 1 large Utility Room. Keep Bath, but w/ hall access. Bedrooms could be smaller w/ Jack & Jill Bathroom.
I love this plan! Nice closet space and pantry. Open design and 12 ft ceilings I would add a wrap around porch though! Would make the exterior look more like a bungalow somehow delete huge pantry for more porch space for a porch swing.