They talk about using this capsule for trips to Mars - presumaby it will be attached to a larger craft for them to live in during the voyage? It looks like there isn't room to swing a tribble. If the capsule is all the room they have they bold voyagers will have killed each other within 30 days.
In fact, why take the Orion capsule to Mars? Would it be too complicated to leave a simple landing capsule parked in Earth orbit and dock and transfer to it on return? Or would approach velocity be too much to allow for docking?
Probably simple and obvious answers, but I'm not a rocket scientist.