The oversized blaster fits well into both of Luke's hands
The Stormtrooper helmet fits well over Luke's head - but it's a little bit too short so the back of the head shows underneath
There are no balancing problems
Disguised as stormtroopers and fighting off a regiment of Imperial troops inside the Death Star, the escaping band of heroes finds refuge in a garbage receptacle. The Rebels realize their problem has changed when the walls begin closing in.