Does this need to be a problem? Seems like there are often times that the physical dimensions of a set or structure differ from the “in universe” size of the object it’s depicting. Often for example an exterior will be built at 3/4 scale to allow for more dynamic camera angles and cost saving (e.g. Rohan from LOTR) Different lenses and camera angles help complete the intended scale effect. We pretty much see this interior from a head on front shot which makes it hard to see the depth. I don’t know if this was the reason, but they would have needed the interior to “read” as “short and cramped” instead of “longer and cavernous”. I think the limited exposure of the set gives you wiggle room to stretch the interior out to better fit the dimensions. In other words - the set is not the travel pod interior, it is just one of the many artificially produced elements that work in concert together to present the illusion of the “travel pod interior”, Which of course is nothing you don’t already know.
