Colin Miller , Jan 13, 2001; 01:35 p.m.
When I cut for my Pelican case, I used a very long and very narrow bread knife. Worked very well. The secret is to use a knife that is serrated, not a smooth edge kind. Since you are sawing to cut the foam, serrated would be best. Smooth edge knives are for slicing. In this situation, you want to saw.
When you do cut, mark the edges of your equipment with toothpicks or other pointy objects. Place the knife at the first one and begin sawing toward the next one. When you reach it, pull out the first pointy object. Then move the knife and saw from the second one to the third one. Check your equipment occasionally against the cut you are making. I love my Pelican. I don't know what I'd be doing without it. I've got my meager Bronica system (body, lens, hood, back in one cutout) and 2 other backs and a Polaroid back stuffed in there. Plus my L-508, 1 35mm SLR and 3 lenses, 1 flash and 1 flash battery. Still room left, too. I still need 2 more Broinca lenses. I bought the biggest Pelican with growth in mind. And it's huge.
Good luck, and let us know how you did.