I'm 6 feet tall and I've met Walter and Billy, and I've stood next to all 3 of them. Billy is tall but certainly not 6'7" ! Steve is documented as 6 foot 2 inches; I'd say Billy is 6 foot 3 inches, just about an inch taller. Billy is super thin which makes him appear even taller. I also bet he dyes his hair black, I didn't see a hint of gray. Also, don't believe the fictitious King of Kong story. Billy and Steve are certainly not enemies and I've seen them talking and getting along several times. IIRC, Billy seemed to enjoy being made out as the K of K villain. And I've watched both play DK many times, they are both fantastic players, there is no dishonesty in Billy's skills. He mentioned to me that newer champions like Wes will mine the game for maximum points, and Billy kind of lost interest in keeping up with that strategy. For example, they will jump over double barrels, climb down a ladder and jump over them again.
Getting back on subject, it's disappointing to read that Billy used Mame but passed it off as real hardware.