I wouldn't sweat it at all @ 5 ft 7 man. Remember, that John Morton played Boba Fett too ... you know his face as Luke's Snowspeeder Gunner in ESB. He's only about 5 ft 7, not much taller than Mark Hamil. He stood in for Jeremy Bulloch in a couple of ESB scenes, one of which was the "He's no good to me dead" scene. The other notable scene was standing next to Vader in the dining room before Vader grabbed Han's blaster. The next time you watch ESB, take a good look at that one ... you can see how he fills out the suit.