Sure the Panatomic-X film could be cut to 4x5. I've used some of it when I
had a Graflex SLR 3 1/4 x 4 1/4 camera and cut to that size. But the two cuts
proved too much of a hassle and the camera was sold several years ago. Also,
if this film cutting proves too tedious, there's still film available in 5x7. And since
I picked up this aerial film for about $60 on eBay, it seemed like a good project.
As far as I know, it's the same Panatomic-X of yore.
I'll add that I don't really have a darkroom. Since I live alone (well, one cat),
I've integrated the darkroom into the kitchen.