What's the largest diameter blade you could fit in there? I'm thinking of one of those little blades like the ones the drywall guys use in those rechargeable saws (About 2-1/2" dia.). They've also got a drill thingy that is about 1/8" diameter that drills into the sheet rock, then cuts sideways for cutting out switch box opennings, etc. I don't know if there are metal cutting versions of these things or not.