One antonym for "cutting outs" could be "additions," which refer to elements added to a design or project rather than removed. Another antonym could be "reinforcement," which involves strengthening or repairing something rather than cutting it away. "Construction" may also serve as an antonym, as it involves building or creating something new rather than removing anything. Other antonyms could include "attachment," "integration," or "fusion," all of which suggest combining or joining things rather than cutting them apart. It ultimately depends on the context in which "cutting outs" is being used, as there are many potential antonyms depending on the specific application.