Why do you have the open spaces I am not sure how a bed would fit in there I guess you should have thought this out before creating the open spaces now I think you will need to get custom cabinets built

Once upon a time this was a game room at a lake house. We are doing a complete renovation and this room has now become the dining room. The old oil tank is coming out. We are always trying to find space for guests during the summer. One idea was to turn the opening on the right into a bed/bunk type space for the kids. Regardless of how the insides are used the builder is making shaker style cabinet doors.