Interdimensional Traveler

You wait for the other zombified human to leave the area, and you walk out. You walk down the street, very carefully, and after a couple of blocks, manage to find an abandoned Radio Shack, which still has reasonably stocked shelves. It does not appear to have been targeted by looters at all.

You hastily try to remember what materials you used to build the previous Interdimensional Traveler. After several hours, you think you have figured it out...but the only way you can be sure is to press a code and find out.