Messed up ignition housing

Hello,

First of all, you will need to figure out what other parts that may have been damaged due to the drilling.
This will require first removing the existing lock cylinder and inspect.
In order to remove the lock cylinder, you will first have to remove the steering wheel.

Here is a helpful guide:

https://www.2carpros.com/articles/steering-wheel-removal

I have attached diagrams below for your reference.

Please let me know of any questions.
Thank you.