My brother drilled the 26 we keep at parent's house. I say go for it unless you have a WSM.
I'm kidding. If you think you will use and enjoy the grill more by modifying then go for it. I hesitated to drill my wsm for a thermo but I use more often and enjoy it more since I did. Do you already use and like the cyberq?Sent from my iPhone using Weber Kettle Club mobile app
If you plan to keep it forever, do it, of you might sell someday, you may need to sell the cyber q with it....