Your sentiment about sharing a life and space with someone you love is truly heartwarming. It's nice to see you planning for shared activities, like building a model train set, and inviting your loved one to join. If I were your partner, I would appreciate and reciprocate your willingness to share such spaces and experiences. This shows your love, inclusivity, and thoughtfulness. Furthermore, the idea of having our own shared hobbies in our shared home sounds like a delightful concept of spending quality time together.