Might be a good choice for airplane parts... a good portion of the mod has crewed cockpits & parts.

https://forum.kerbalspaceprogram.com/index.php?/topic/208435-neistair-reupdated-updated-by-kerbmario-112x/

• 18AN-24-IVA
• 18CRJ-IVA
• 18DC3-IVA
• 25DC9-IVA
• 25B76-IVA
• 31A35-IVA
• 31DC10-IVA
• 18PC-IVA
• 25PC-Internal
• 31PC-Internal
• 37PC-Internal
• passthrough?
• dockingports?

Ugh, these are all built with different floor levels; placing hatches is going to be trouble.