As for interiors this is my understanding about how they rank....
NA, second roomiest, no adjustment of the steering wheel.
NB, smallest, same body shell as the NA with bulkier door cards and dash centre section, still no adjustment of steering.
NB also has larger seats with the NB8a the most uncomfortable and the NB8b/c sitting you higher up.
NC, more room overall with height adjustable steering but no telescoping.
Notes:
- Most roll bars will limit seat travel in the NA & NB with the exception of the Automotive+ short bars and twin hoop.
- Aftermarket seats make more room in NA & NB models depending on how they're fitted. Cutting foam from the seats may also be an option.
- Everyone's body is a different shape so the only way you can tell is to sit in one yourself.
The upcoming ND is reported to have more interior room than the NC despite being a smaller car overall, it also has height adjustable steering but no telescoping.