I am about to order a kitchen but not sure about a few things,i want to make sure my wall units next to my free standing cooker are inline with my base units(does that make sense)I am going to have a 900mm corner base unit with a 400mm door the corner wall unit above is 600mm and a 400 mm cupboard bolted next to it but I think they will not line up? does anybody see where iam coming from???