This is solid. And very straightforward. Maybe it could have used a bit of a twist, competing thieves, or a security surprise. For a classic heist scenario I would need more approaches to the target. It is easy enough to come up with these things as Warden, but why not seed a few ideas in the text? The font is huge, there would be room. It will run fine as is, but it feels like there are a lot of opportunities for making it come to life and anticipating player ideas left out.