Bathroom gut renovation currently taking place. The plumber just installed a Kohler Archer 66 inch by 32 inch three wall alcove tub (Exocrylic). He set it on cement. The bottom of the tub feels solid. One of the inside side walls can, with little exertion, be pushed in. The opposite wall also has some play in it. It squeaks when one sits on the edge. The tub seems very flimsy (paid close to $900). I am thinking about halting the project, removing the tub, and looking for a more substantial one. Does anyone have the Kohler Archer 66" by 32" Exocrylic tub installed? If so, can the side walls be pushed in? The contractor who will be grouting the tub and laying the tile is concerned that the grout and tile will come loose given the amount of movement that currently exists. Thoughts anyone? Thanks....