Originally Posted by
aTailOf2Kitties
I think he is trying to build a battery powered can opener. The pencil and chalk are to draw blueprints on the back of the sandpaper, which will first sharpen the knife (to open the can). The brackets, screws, rubberband and wire are to attach the machine to a secret hiding place. He needs the magnifying glass to read the business cards to look for some "connections" where he can get supplies he can't find around the house. Lip balm is to lubricate it to keep it quieter, but the earplugs are so YOU don't hear him using it if it's still too noisy.
Clever clever kitty!