Grant is observant, insightful and sensitive as Troy observed. Grant is going to need all those and maybe some strategy to navigate around Troy's barriers. I hope as the job progresses Grant starts to talk about some of the other projects he has thought about doing on the house. That central heating really needs to be completed, and would mean minimal exposure inside the house if the ductwork Troy started to install is intact. It would give Grant more time to learn about Troy, and help him in other ways. Since Grant and Troy are both aware that Troy is living in the van, Grant might offer to let Troy use the laundry and shower room if Troy needs to stay an additional time to do more work. Someone said that a chair replacement might or might not work. If Grant requested all new chairs and use of the workshop to do them, it might not bring up the old memories of how the chair got broke.
Troy's defenses are strong, but between Troy's great needs and skillful maneuvering by Grant I'm hoping a few cracks in those wall will happen.