Designed in fusion 360, printed on a P1S, wired and assembled this model rocket launcher control unit using parts from amazon. Keyed power switch, integrated continuity test, and a BIG RED BUTTON, added a connector i had left over from another project so the cable can quick disconnect. 

Powered by a 9v battery and adapted it to also connect to my Milwaukee M12 battery.

Storage on the side for battery, cable, extra rocket engines, etc.

Built into a harbor freight apache 2800 case using a press fit mounting ring (also printed) with heat set inserts and M4 screws.

included the mounting ring STEP file if anyone wants to use that for any other project in the same case.

this is easily adaptable to whatever electronics you have / choose to get.