I wonder if the type of shielding tape that is meant to be used in electric guitar control cavities would work well for this purpose? It would be fairly manageable and could be easily cut to size.
If anyone is interested in some shielding material, Electronic Goldmine sells some nice sized sheets of Ultraperm, similar to mu-metal for a very affordable price.
http://www.goldmine-elec-products.com/prodinfo.asp?number=G18646"The Ultraperm 80 is similar to Mu-metal but the copper which is added to make Mu-metal more ductile is not added to this sheet. This shielding is commonly found around transformers in high end audio equipment, cathode ray tubes in oscilloscopes, photomultipliers, magnetic phono cartridges, hard drives, super conducting circuits, MRI equipment, etc."
