BELFAST, Maine — In Sam and Mickey Green’s basement, model trains circle around an elaborate town that is based on a community that is very close to their home and their heart: Belfast. In this miniature version of the midcoast city, an elephant perches atop the Colonial Theatre, a small handcrafted travel lift hoists a vessel out of the water by the Front Street Shipyard and tiny people enjoy lobster rolls outside the Must Be Nice Lobster Co.’s lunch wagon.