Everybody goes on about the "narrow" B737 fuselage--it is the widened version if you recall the B707 history.
Regarding storage of tooling, it's real expensive to do and with the advances in technology becomes obsolete pretty quickly. The USAF paid Lockheed to store the C-5 tooling and in the run-up to the C-17 chopped the money and Lockheed got rid of the tooling unnecessary for the C-5M model conversion line.
GF