trying to figure out realistic logistics for space elevator stuff on erid and jesus christ. a trip from the top (where the dock would be, past the rings, WAY into the exosphere) to the surface would like. realistically. take something like 5 earth days, if they went at a speed that would not kill grace. The logistics of feeding him, getting his oxygen to him, bathroom time, sleeping (!!!), all of it??? oh man. This is not a casual 3 hour trip. this is a fucking ENDEAVOR.
so! The limitations make constant trips up and down impossible. Let's work with the constraints.
This means Grace's ass is STAYING on the hail mary until they have his biodome ready, and they are scrapping as much of the Mary's internals on that same trip, because this is an undertaking they are doing as few times as possible.
This also means! That if rocky goes to the surface! He CANNOT come visit Grace on a whim!!!!!! Which has lots of potential story bits, trying to make their only meaningful contact be long distance radio call and making that work (poorly. the shenanigans... etc)