For its painstaking physicality alone, stop-motion is inherently impressive as an animation technique, no matter the scale or budgetary specifics of the project. But when artists, like those behind the ambitiously crafted phantasmagorical musical “ I Am Frankelda ,” throw caution to wind to build an imposing universe to animate frame by frame, one can’t help but feel in utter awe — warts and all. Gothic sets with baroque architecture — that not only catch the eye but prompt one to wonder how