After thinking of some alternatives, we have decided to continue with our rough but functional foam prototype. It is probably representative of what the final thing (during this course) will look like, as things are taking time and the exhibition is getting closer.
In order to make it slightly more robust and to give it a bit of metal look (maybe) we are covering the gun in duct tape (material of choice for the hacker). Simultaneously we are running tests with the wiimote, actual digital test game, recoil system and micro controller firmware.