The issue is that at the average height of the astronaut the rotation speed at their head would be half of that at their feet given the 4-5m modules we can laun

The issue is that at the average height of the astronaut the rotation speed at their head would be half of that at their feet given the 4-5m modules we can launch. I don’t know what is the maximum difference that would be tolerable but it’s not 2x for sure. So to get it down to single digit % you are looking at 200M+ or so in diameter. If it’s just for sleeping and liquid pooling at the back won’t pose a health risk then if they are lying down the diameter can be much lower but you are still probably looking at 15-20M which might be possible with inflatable modules I think 3.5-4X expansion would be quite possible with the existing inflatable modules we have.