We do not do resin concrete/ceramic stone/stone resin trays, call them what you will, because of their inherent problems with thermal shock (cracking due to changes in temperature), the fact that the coloured layer is just a gel coat which wears off, almost all do not have any built in ability to level them up and they usually need to be raised up to get the plumbing away. They are not, as is often thought and often implied the same as the old glazed ceramic shower trays.