I would think that would be pretty expensive...fun, but expensive. I had thought of making a mold of camera out of clay and then getting a type of plastice that could be placed over it and when heated it would conform to the mold. I would have an exact mold of the camera. The problem is it is just plain easier to go and buy a pelican or other comparable case.
I used to work at a kayak shop where we had a thermal vacuum table for molding the plastic seats, thigh braces, etc. Our molds were made of aluminum, some were made of fiberglass/bondo. I think the hardest part for you is going to be heating the plastic in a uniform fashion. We had heaters that would heat the plastic on both sides, we would use a 4 x 4 hard sheet of plastic, and would heat it until the plastic developed a big "belly", then moved the heaters, and raised the "table" with the mold on it, up into the hot plastic, and then turn on the vacuum, and let it cool. We made this thermal form machine, but it was big, and expensive. Good luck to you if you decide to do it!
3/16 H.I. Polystyrene in sheet form. Build Vaccume forming table w/ shopvac for vaccum. Build frame and heat plastic on rack in oven until it bellys. Table only needs to be 18" square. Plaster of paris mold or somethig else. Sooner or later I'm going to try it. Already found a source of plastic.
Next time you go to the dentist, ask him if he has a vacuum former. I hink this would give you a miniture version of what you are trying to build. I will graduate from dental school in may and have tried to figure out how to do the same thing. You may try to make your mold using dental stone or plaster. You could probably buy that from your dentist also. You just mix it with the appropriate amount of water and it hardens very well. Keep us posted!