I did the math on how much volume would be required for a single colonist in a relatively small hibernation pod and realised that the cryogenic modules were far too small. In fact, all the various commercial modules were too small to be realistic, so I starting scaling everything up.
Speaking of size, I think the current habitat modules are also far too small to be realistic. A 250,000 dT habitat module houses 200,000 people, which is 1.25 dT per person, or about 17.65 cubic metres per person. A cube of that volume has a side length of just 2.60 metres, which is nowhere near enough for a person to not lose their sanity. And that's ignoring the fact that some of that volume must be allocated for life support, recreation, hallways, utilities, businesses, infrastructure, etc.
I think habitats should be around 1,000x as large as they currently are, at the very least.