Yes, if you caught them quickly after death, you could freeze them and use them later. If they sit too long though, they will begin to rot, so the smell might get to you after you've thawed them.
Here's a pic of my rat rack:
http://i175.photobucket.com/albums/w...us/RatRack.jpg
It's about 6 feet tall--I'd guess the tubs are about 8-10 inches high? Never really measured them; I don't know how wide/deep they are.