Laser cut from 6 mm (1/4″) material. Use 24 M3-12mm screws and nuts to fasten the case together.
This is a basic box with openings cut for four peristaltic pumps, mounting holes for a Raspberry Pi, and holes for the a monitor cable, 12 volt power cable, and USB cable to come out.
This needs to be placed on a shelf, or other support, or mounted to something in order to have it above the supply bottles. No affordance as yet exists for managing the dispensing side of the tubes.