Wanting to enlarge spare bathroom by removing the short wall between the bathroom and cabinets in hallway and then removing cabinets and reframe the space. Doorway would line up with new wall. New wall would meet up evenly with closets at each end of bathroom. Should be enough space to left of shower/tub to allow for a built-in tower of around 24" wide. The current wall being taken out is 4.5" thick. Assume most of that thickness if not all, would be needed for maintaining stability of the tiled shower wall. Would not take the tower to ceiling due to 10' ceiling, maybe only 7-8'. Floor tile and vanity/sink/countertop are being replaced as part of a bigger project. Comments? Approximate cost?