Surprisingly the hardest parts to find were the utensils. After weeks of scouring my local flea markets and thrift stores I wound up swapping my mom a new strainer for her old one and finding a "close enough" masher at Target. The metal detector was an Ebay find, it was going for $10 as it was "broken". The only problem with it was corroded battery contacts and after cleaning them up it worked fine until I ripped the whole thing apart.
I've posted a full build up on my website here: http://www.angelfire.com/pa2/jdoud/kudmeter.html. It's got the blinky light, the needle moves and it will buzz when I push the red button so I can sweep people. I want to figure out a shoulder strap as having to hold it all the time will get to be a pain and I wouldn't trust hanging it on my belt. With 6 AA batteries and stainless steel utensils it's not exactly light. C&C welcome.