Discovery channel tried to do this a while back with three regular guys.http://img527.imageshack.**/img527/4970/large8eu2.th.jpg
?Bruno, a professional drag racer with casual tales of crashing at 230mph; John, the super keen jock, blessed with quaint 'sir and m'am' good manners that only Americans can do; and Johnny, a former reality show winner with a nice line in weird humour.?
The pilot must have been offal, and I can see why, they didn't have a person who actually was on TV before. Remember that all of Top Gears host had been on television. May stands out as the one with least experience but did have some experience and im sure had coaching. Hammond and Clarkson had a reserve of experience and im sure goes to their professionalism. I just hope they don't bother with anyone who does not have either acting or news background and on screen time.