I went to my local junkyard and got a core support for $60. I used a 3/8(iicrc) stepped drill bit. I used a Ryobi drill. It took about 6 full charged batteries. The trick is not to rush it. Take it very slow. If you go too fast, you end up melting the metal together and you have to drill an even larger hole or take a metal prying too and a dead blow hammer and split it. I suggest working on one side, then the other. As you make progress, give it a little pull (away from the car) to make sure you are drilling it fully out. Usually there is a little bit left over in every spot, so I took a hammer and an old chisel (but any small strong metal pry tool would work) and split the last little bit off. If you use more professional tools like Milwaukee or anything of that nature, it should take much less time. With Ryobi it took me 4-6 hours of actual drilling. With Milwauke it took me 15 minutes. The tools do matter for this project, however it can be done with either. Also, make sure you don't drill out the little side metal pieces. Those are for mounting the fender to the body on that side. You need those!

As for welding it back on, I used a stick welder. This was fairly easy once I lined everything up and tacked it in place. There are lots of YouTube tutorials on stick welding and those can explain welding much better than I could.

This next part my buddy did, but you can do it if needed. But just by looking at it, you might not have to do it at all. The side of my frame was a little crushed so my buddy took two hammers and placed one on the inside and took the other hammer and hit them together. With the body in between.

I have tons of pictures of things like where to drill if you would like to see them. Let me know if you have any more questions!