lace pickups (practically noisless) into a telecaster wont need much shielding, only the neck pickup is out in the open, the rest of the electronics are all shielded by design (control plate and bridge being made of steel/brass).
still that doesnt explain where the hum is coming from though.
I don't agree I think that shielding will solve your problem.
Try this site
http://www.guitarnuts.com/wiring/shielding/tele.php