You need to make a camera film with emulsion on it, a reciever layer with shutdown materials on it, and a method to capture the image and you need to produce a pod that will process the film.

All three require some rather specialized equipment, and pod making is hardest of all. We made them under an inert atmosphere at Kodak.

In addition, you need the pull tabs, rails to separate the two pieces of the packet properly, and you need dark covers on each half to protect the film from light.

It does not matter where you place it, the answers are the same. Instant products are very very hard to make.