The%20P-51%20Mustang%20was%20a%20long-range%20World%20War%20II%20fighter%20aircraft%20that%20flew%20as%20a%20bomber%20escort%20over%20Germany.%20Powered%20with%20the%20British%20Rolls-Royce%20Merlin%20engine%2C%20it%20was%20unmatched%20by%20any%20other%20piston%20fighter%20aircraft%20of%20World%20War%20II.SpecificationsItem%23%3AMMS003Number%20of%20sheets%3A1%20SheetDifficulty%3AEasyAssembled%20Size%3A3.54%26quot%3BL%20x%203.74%26quot%3BW%20x%201.18%26quot%3BH(9%20x%209.5%20x%203%20cm)Ages%3A14%2B