i am replacing a window in the shower. can someone comment on potential problems i may have with the following method of installation. i plan on taking the old aluminum window out and expose the wall studs of the window opening. i will wrap the rough opening with flashing and then put in sill for window to sit on. i plan on caulking the sill to the opening filling any voides. the window will be attached to the rough opening that has been flashed. i will caulk on all sides filling all voids. to seal the window. since the window does not extend to the cement board that will be tiled, i plan on using waterproof membrane up to the window and wrap around the edge of the cement board. on top of this i plan on putting corian to finish this area. i will secure only with caulk. (silicone) the window is a replacement type. no nailing fin. and is around shoulder height. there will be only a small inside sill that will be angled down so no water can sit. does anybody see any issues with doing this .