GHOSTBUSTERS  Pronton pack MK21 qpack
Free     Printables     Kiou

GHOSTBUSTERS - Pronton pack MK2.1 q-pack

Here is my take at an easy almost fully 3D printable and accurate proton pack shell with all the external parts models ...

similar models —

GHOSTBUSTERS - Pronton pack MK2.1 q-pack alternatives
Ghostbusters coaster
BullseyeP90