After receiving the divine inspiration from Budddha (yeah...lame joke) I decided to make my own DIY pistol case. I'd been thinking about it for a while, but after seeing his it made me think that instead of making the box from scratch, why not use something common. I went to Wally World and picked up this Vaultz 128CD binder for $30 and some change.

After getting it home, I took my wire cutters to the rivets on the inside that hold the rings in place (there are 6 total), squeezed the rivet thing together so that the binder rings would slide over them and then super glued the rivets in so that there wouldn't be any ugly holes in the side and it would still look like a CD binder.
I took this after I had already removed the rings, I just set them back in place so you could see what it looked like before.
And here's after the rings are removed.
For the foam, I used some foam padding that came in a box that IBM shipped a replacement RAID controller in for our server at work. It just so happened that it was exactly the right size

For those of you that aren't lucky enough to have to replace a RAID controller, you should be able to buy foam similar to this at a hobby store.
Now, all that's left is for you to place your weapon of choice over the foam, draw an outline, and cut out a 1" deep (or thereabout) trench in the shape of your pistol(s). This case will comfortably hold both my Glock and 1911. I'm going to get another piece of that foam from work so I can cut slots for my Ruger MKIII and CZ-52 and have an interchangeable case (until I buy another CD binder to mod

) You should be able to fit 2 full size pistols and up to 5 smaller pistols in here. The netting on the left side of the case makes a nice mag holder
Here's a picture with the 1911 slot cut out, I used a utility knife with a razor blade to cut the outline (in about 5 square inch segments) then used my fingers to pull the foam out. It worked well. This whole project has taken about 45 mins so far, including writing this and taking pictures.
I hope this helps somebody out there. I know you can buy pistol cases for pretty cheap, but it's always fun to make them yourself!