I'm fancying whether it's possible to build a pen-sized toy missile which could, for example, hit a street lamp at night from within 200m, just as a proof-of-concept. I would like the missile to have an infrared imaging camera, and a low-cost programmable micro-processor which analyzes the image and issues signals to the fins to adjust the flight path. Gun powders as rocket propellant would be quite adequate for my desired range. I'm not interested in doing any damage (and certainly want to re-use the missile), so the mini missile doesn't need to carry any "warhead". Based on your knowledge about engineering (aerodynamics, infrared imaging, microelectronics etc), do you think it's possible to build such a small device within reasonable cost for amateurs? Thanks for contributing your opinion. Clarification: Please do not delete the thread as "dangerous activity". The motivation is entirely academic.