Sub-Zero Installation Out of level floor

We have just had an issue during the installation of the new Sub-Zero & Wolf Display at Kitchen HQ in Perth.  The installers started installing the cabinetry from the lowest point on the floor and trimmed the cabinet bases to the highest point.  By the time they reached that point, the opening for the ICBBI-48SD/O was too low.  Always check the level and start the install from the highest point or allow for it in the opening height of the cabinets.