leveling a kitchen unit

you have to start with the corner unit and work your way down to the end tall unit.
most kitchen units have a 150mm plastic leg which the unit rest on so if you want all your units to line up perfectly with one another you must fix a kleet(plank) of 70mm wide by 2000mm in length under 150mm from the floor.make sure the plank is level then place your corner unit
on the plank first.once that unit is in place you can place the other units next to that one on top of the kleet.if you leveled the kleet properly and and the kitchen units will line up properly and the kitchen unit door will also be level.