Pi 3b as WiFi camera DVR/network storage

Too long details don't matter.

I'm picking up 3 rechargable mini WiFi cameras and slapping some cheap micro SD cards in them. I'm placing them around to catch someone doing something they shouldn't be. If they find them, I still want the proof...obviously. I have a Pi 3b and a good USB WiFi Adapter. Would you go Android OS with an app to pull all cameras in and have detected images sent to the pi via WiFi? I have a 512gb microSD I can use. I'm also going to put the pi in a case with a small touch screen to set it up, once it boots...or maybe I can make it auto run as a service. In case you haven't noticed, I'm doing this as cheap as possible.,

HELP.