Amaral Custom Fabrications has worked on projects ranging from outdoor sculptures for internationally known artists to dozens of 6-foot-tall versions of Mr. Potato Head for Hasbro Inc. The latter were used in a tourism campaign to promote Rhode Island as a family-vacation destination. Last month, owner Paul Amaral, above at his Bristol shop, won a contract from the Lichtenstein Foundation for an outdoor sculpture that will allow him to add as many as 10 workers to his current staff of 14.