Contributed by Jonathan Stevenson / Located in rough-and-tumble Newburgh beyond the pale of riverfront commercial development on a piece of land just yards from the Hudson and insouciantly flush with its waterline, Carolina Wheat and Liz Nielsen’s grandly unvarnished Elijah Wheat Showroom has the Bunyanesque vibe of a frontier museum. Then it suavely wrongfoots its patrons with the fearlessly avant-garde attitude of 1970s Soho. Matthew Lusk’s deviously clever sculptures and installations exploit and reinforce both attributes…