Dimensions are a little wonky, but so far, so good; it fits well, and even without the screws, the plate was able to hold the lock. I added a bunch of 3M tape to the underside and stuck it well to the door.

I included a couple of different versions of the base plate: 

• a taller version to accommodate longer keys;
• a shorter version that is closer to the original SwitchBot one.

I'm sorry for any rookie mistakes. I had never touched any CAD software before this little project, and it was a fun learning experience.

Settings used for printing:

• 20% infill
• 0.2mm resolution
• No supports
• No rafts