They had one incomplete tweet engine at the school where I got my A&P along with more modern engines including several that were from other military aircraft. The instructor told us that the engine came from a tweet and was part of a group of non functional but fairly complete engines, mock ups and cutaways that came from the Air Force surplus and was donated to the school. The engine instructor said part of the tweet's barrel shape was because of the engine in it. It was centrifugal compressor rather than a much slimmer true turbine compressor. The engine, when vertical in an engine stand looks much like a kettle drum.
