i've built 110 cartridge cameras with kids around 13 yrs... they seemed to like it, and it's very easy. it avoids using a darkroom, which may or may not be to your advantage...
there are lots of sites adapting the instructions formerly posted by kodak. this one is pretty fun: http://pinholespy.com/ one last thing about photo-flo/dish soap: as someone who is not by any means a chemist, i have been interested lately in the "household chemistry" darkroom. this has led me to alternatives such as the dish soap for photo-flo, as well as other more interesting formulae like a coffee developer (there is a vitamin-c version as well). i'd be curious if anyone on the list has experimented with this... the motivations to substitute are varied, but mostly NOT economic. some people do this for environmental reasons, others just to experiment. the results i've seen (especially from the coffee) are pretty amazing. /aaron
