how do you gain Cassie's trust to capture and renovate?
After don you go check in on her talk to her take her on a date to New Ark, wait awhile (sleep a few times) then talk to her again go on next date to the Milk Farm after that you can do things with her upstairs (so probably by this point) if not then try all 3 options (each new one unlocks after you do the first option so first there is one option then after you do that two options so on) by this time you should be able to renovate remember it cost 10k to do so so make sure you have that money laying around before you do.