I meant the Jedi Starfighters. On the Episode III DVD features they fessed up that Artoo’s bottom half would stick out the bottom in real life if they didn’t cheat it. Why they simply didn’t design a larger ship to fit him I have no idea. IIRC, the AOTC fighter droids are permanently attached to their ships, (being little more than a head) yet Obi Wan seems to have the same R2 unit in ROTS.

The less said about how Artoo gets his head out of the Naboo fighter droid socket, the better. 😉