There's a crowd gathered at the bottom of one of Glasgow's steepest streets. Hardly surprising since Spiderman is weaving his way down the now-transformed New York sidewalk. Hollywood star Glen Powell is in another part of the city centre working on his latest thriller, The Ghost Writer, while Joel Coen and Frances McDormand are scouting back streets for their Gothic mystery, Jack of Spades. In the midst of these blockbusters, twin brothers Ben and Nathan McQuaid are fashioning their first