DC shelves with top cupboard

DC shelves with top cupboard

pieter B.
sketchup issues forum: I altered a spt-dc to show my problem: I want the top shelf to be a cupboard no matter what heigt the shelving system is. The height of this cupboard is difficult to make as it should keep the spacing intact. By Z-scaling this model you'll see where my questionmarks rise. Has anyone any suggestions or can anyone see where I made a mistake? Thank you.
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