First of all, you need the camera. Tha agfa clack was introduced in 1954 and uses medium format film. But with a small modification you can also use 35mm.
I chose the agfa clack because it is robust, cheap and easy to modify. You can get this camera for a few bucks in online auctions.
If the housing is o.k., don't worry about the function. There is nearly nothing that can get broken.