I think I'm about ready to give this a try. I have some experience coating glass with albumen -- which is probably thinner than gelatin. I think the rest I'm just gonna have to learn by doing. Time to start rounding up suppliers!
It'll be interesting to see how handmade gelatin negs compare to albumen.

This whole adventure began because I had this crazy idea about sensitizing albumen to infrared, but the speed is just too slow with ULF pinhole. I put the IR idea on the back burner for now, but I would like to be able to do 11X14 pinhole portraits, and looks like gelatin is the only way I'm going to get the necessary speed.
I'll keep the forum uprised of my progress, if anyone's interested...