For the carpet, you could get one of those plastic mats designed to allow office chairs to roll nicely on carpet.
As for the sheet metal, I would think no. Wood doesn't spark or conduct.
LOL, i just finished telling my wife i need to pull the carpet out of 1/3rd of the family room down stairs and put in a 3ft high 8 ft long dividing 'wall' and some laminate flooring or lino down...... she is not happy with me right now LOL yeehaw here we go
roger that on sheet metal might be a bad idea hehehe


















































