Drawer cabinet for assortment boxes

I always wanted to have those drawer cabinets for my assortment boyes, but the version one can buy are stupid expensive, so I thinkered around until I came up with this idea.

The main goal was to be able to built them with just a saw and a drill and I think I achieved it.

BOM for one drawer:
M4x12 countersunk head screw (Senkkopf) 8pcs
M4x6 rounded head screw (Linsenkopf) 4pcs
M4x18 rounded head screw (Linsenkopf) 4pcs
M4 Nut 16pcs
Pull out rail (Vollauszugsschiene) 2pcs
Multiplex (9mm) 365mm x 50mm 2pcs

The pull out rail I used is 35mm high and 300mm long.
I ordered it at so-tech under the number: KV2-25-H35-NF

BOM for the wooden box:
Multiplex (18mm) 600mm x 305mm 2pcs -> Sidewalls
Multiplex (18mm) 406mm x 305mm 2pcs -> Top/Bottom