The irony here is that Hasselblad cameras are known for their amazing Carl Zeiss lenses, coupled with precision leaf shutters. But now for considerably less money you can craft your own Hasselblad that has neither.
Treehugger has links to the downloadable PDF plus an instructional video. The creator of this project, Kelly Angood, also has a tumblr gallery of pinhole images where DIYers can submit their own photos.