I’m sure someone’s done this already, so since I haven’t built my kit yet, I thought I’d see if anyone could recommend sound/light kits for the pack - something I could install as I go. Advice?
It sounds like you are looking for a premade option; I cant help you there, but if you feel comfortable with soldering and assembling your own kit, CountDeMonet’s light kit is fantastic for ading simple lights. Best part is that you can get everything for around $10 if your ok with ordering from China through ebay.
Here is his thread 3D printed Neutrino Wand and Proton Pack with Arduino lights and sounds - GBFans.com
Here are his files on GitHub: GitHub - CountDeMonet/ArduinoProtonPack: Arduino Code for a GhostBusters Proton Pack · GitHub
If you are ONLY looking for a prebuilt option, disregard.