Jr., Son of Beast, was designed by Werner Stengal. Stengal designed the Outer Limits at PKI & PKD and Alpengiest at BGW. He comes up with some of the most wickedest, insane, and awesome coasters. The lap bar question I don't know. Does anyone know that answer? The theme for SOB is like a King Kong movie. The area is supposed to be a military-type holding pen for Sonny. The Beast's son is captured and put in a crate (the crate for the ad at the park last year). Then the Son of Beast escapes out of it's crate(like in the picture with the busted crate opened). The riders have to hop in the train and "capture" Jr. I myself thinks it is a good theme story. I'm looking forward to April 29th. That's when Jr. is unleashed! I hope that answered some of your questions.
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THE BEASTmaster