The Middletown Planning Board heard positive changes on Sept. 11 in a plan to construct a commercial building at 985 Aquidneck Ave. But there is still opposition from abutters and possible legal questions to be answered. Gregory Coe, of Seascape Holdings, unveiled new designs through his attorney that significantly reduced the “quantity and scope of the many waivers” he had requested, while slightly reducing the size of the building and improving its exterior look.