Ok, so I don't *live* with my significant other. But I can tell you what happened to get her to love the cabinet. Two things:
1. Focus the attention on her favorite retro game.
For her this was Super Mario Brothers 3. Turns out she used to have a nintendo so having that game on there - and EASILY accessible was crucial. One of these days I'll pony up and get a retrozone Nintendo controller with USB so it even feels right.
2. Get her stuck in front of a "real" cabinet sometime.
I don't know how you can plan this, because just forcing her in front of one is only going to make her bitter. But my girlfriend got stuck at a Fire department one day, for work. They had a multicade cabinet. Ms Pacman, etc. I didn't get to see it but I assume it's legitimate, and it's definitely of high quality. She got home, and she wanted me to build her a cocktail cabinet.
It's not as important, so i didn't number it, but I'd also shoot for as much quality as possible. Short changing your design (with dumpy wood, or poorly integrated artwork) is likely to cause your cabinet to get thrown back into the garage. If you have rough edges that require her to wear gloves while playing you're not doing yourself any favors.

Joseph Elwell.