A proposal to convert the former Ellis Curtain factory in north Plymouth into an 18-unit residential condominium recently earned approval from the local Zoning Board of Appeals. By a 5-0 vote, the board granted a special permit to Megryco for the project, at 278 Court St. The curtain factory closed within the past year and Megryco has an agreement to acquire the property, according to town officials. The Planning Board had voted to recommend the special permit be issued. Meanwhile, the Planning Board recently voted to recommend that the town’s building commissioner grant a permit allowing Colonial Ford to locate an automobile dealership on a 27-acre site on Pilgrim Hill Road. The plans call for a 50,600-square-foot building with parking for 741 vehicles. Colonial Ford intends to relocate to the site, which is owned by Cumberland Farms, from its current location on Samoset Street, according to town officials.