Well, I do......!:-D Actually, I would not do it that way, air-arc gouging is the way to go. You can cut nickel weld with gas but it only takes a small bite at a time and is more suitable for cutting through a butt weld, fillets are rather harder!
The mounting holes are only filled with a stud, they didn't just gas-axe the bolts and leave them there.
Do you have a bow machine gun mount to go in it?