Storage Unit for CD style shelving unit

i was asked to draw these units up to fit into an existing shelf unit designed to hold CD's in , there are three sizes of recesses that needed boxes to insert draws into to store 3 d printed items such as keyrings and flexi items , and they had decided to donate the cds and rather than throw away the units and replace them , we decided we could repurpose them , the recesses measurements are as follows :- large 210mm x160mm x150mmmedium 210mm x150mm x150mmsmall 50mm x160mm x150mm they were designed in fusion360 and an svg applied to front of the draws to give a nicer finish there is a dropped top to allow for the shelving pins as shown in the pictures , this space make a secret space to store things out of sight added bonus as hidden once unit installed ( this means the main units need to have tree supports selected ,