This guy gets it all right. Redditor Muffinman5423 not only built a TARDIS, but he put the proposal on the TARDIS itself and then gave his fiancé a key to the TARDIS along with the ring. That is a classy proposal right there. You might even say timeless. It tugs at my Hartnell strings.
When they are expecting their first child, I bet they build a robot kid with a gas mask to announce it to everyone by asking, “Are you my mummy?”