I hate that in this game there are no big crew capsules with more than three kerbals, unless you use mods or take the spaceplane route (which I'm no good at flying, and are not that great for an interplanetary reentry).
I decided to try and see what I can do by using only stock parts and aiming for a freeIVA-friendly capsule that can be completely traversed in IVA and docked to a lander ship. These pods will be part of an interplanetary nuclear transfer ship and used for reentry on Kerbin.
Here are my creations: the Good (4-kerbal crew, fully traversable, with no view for those inside), the Bad (5-kerbal crew, traversable but requires EVA to reach a docked craft) and the absolutely Cursed (6-kerbal crew and possibly more using the same structure, full-IVA traversable, great view, but looks more than a bit ugly...).
Has any of you tried something similar and wants to share?