I recently paid a plumber @450 to install a kholer archer tub (60"x32") in an alcove. he had to move the old drain from 13 to 16" from the back wall and out about 9" from the right wall. There is a cutout from the substrate that was "plugged with gypsum board under the pipe (I am guessing to seal the plenum and drafts, attatched from underneath.) When all was done I had noticed this hole was now completly uncovered. A few things concerned me which varied from the instructions. Please note I did install two 1x6 boards across the joists where the feet of the tub would be so they would not go through the substrate. This was similar to the original tub install.
1) the feet were not attatched with adhesive which was suggested in the manual if no mortar/thinset was used.
2) The manual said that the gasket on the overfill drain pressing on the outside of the tub should have a bead of %100 silicone and there was none. The arger has a long horizontal shaped overspill drain. The Gasket on crossection looks like a U.
3) the shower head was left at 83" above the floor
4) the hole was left uncovered in the substrate and is about 13" by 7".
5) To my surprise, after the work was done he said it would only be warranteed for 30 days!
Should I be concerned about any of this?