Since it appears we can’t talk you out of this project I have attached the orifice size chart, you need to remove the orifice in each burner control and look for the number stamped on it, this will give you your starting point, once you have that info you then need to search for an orifice drill set and pin vise.
The problems come in when you don’t get the orifice size perfectly matched to the burner holes and fire either comes rolling out the back of the burner or you have super long yellow flames that burn like crap and produce CO and soot.
I would keep this grill as far as possible from anything flammable.
* if you do cause property damage and the insurance company investigation proves you DIYd your grill they will likely tell you to pound sand on your claim
good luck