go to a camera store and check it out. see if its what you want. it seems like a pretty good system to me, since ive tried to cut my own from solid foam and its not that easy to cut. might be easier with a hot knife/ wire or something.
its cut in a way the foam is a block and you rip out the little squares to form the spaces for your electronics. its really a good idea since cutting your own spaces in foam is a pain in the ass.