AUSTIN — “Honey, what should I wear today — my blue shirt, or my enormous cyborgian exoskeleton?” A new startup from Japan called Skeletonics is showing off a very cool, very frightening homemade external skeleton here at the South by Southwest conference in Austin. In what should be very exciting news for my fellow nerds, operating the suit looks like driving a Jaeger, like our heroes do in the movie Pacific Rim. And note that a complete suit would have a more polished design: Mako Mori fantasies aside, the Skeletonics suit is probably more notable, technologically, for what it doesn’t do than what it does. Other researchers and entrepreneurs have endowed exoskeletons with awesome power, giving the wearer superhuman strength or speed, or a heads-up display in front of the eyes. According to the two young Tokyo-based inventors of this exoskeleton, however, the Skeletonics suit is “for entertainment.” It features no on-board computers, hydraulics or electrified parts: Just aluminum and springs and nuts and bolts.