I'm inspired to try after seeing the kickstarter for the fojo enfojer which uses an image on an iphone instead of a negative to enlarge onto ilford paper.

Has anyone tried anything like this? Or do you have any idea of what it would take?

I'm thinking a black and white inverted image on a tablet with a flush glass screen and put it right on top of the paper. I figure I will have very limited control, it will probably be impossible to dodge or burn or even do test strips accurately.