We've got our bath tub mostly installed. The bath tub came with a manual, plus we've read a lot about bath tub installation. Here are a few things that were done for ours that don't match the manual... are these OK or will I have a surprise down the road and swim in my apartment? 1. No mortar bed was installed underneath our bath tub. Our bath tub has adjustable support feet. 2. No ledger was placed to support the edge of the bath tub. 3. Sheetrock will come on top and cover the edge of the bath tub. The manual shows the bath tub being adjacent to the sheet rock, supported by a ledger, and finally tiles coming down on the wall and silicone for sealant. 4. The contractor made a cut to an edge of the bath tub to fit it between pipes. Our bath tub manufacturer says that the 20 year limited warranty is void if any change is made to the bath tub or if the bath tub is not mounted according to their recommended procedures. Should I be concerned here? I'm posting a few pictures and manual figures in case you need them.