If you not try Rom Porter 1.1 (fixing bootloop tool)
I tried all the bootloop "fixes" - none of them worked.
Sorry, but no. The last version I tried, when I finished and restored my normal ROM, the wifi wouldn't turn on. I tried several nandroid restores in CWM going right back to December and still no wifi.
I finally got it working again by installing stock 2.1 ROM and recovery and going through the initial setup stages. Then when I restored from my CWM backup, wifi was still working.
Anyway, it was a bit scary and I'm not going to risk uploading something that I know has a good chance of breaking someone's phone.
I know how much you'd like CM (although I don't really know why), but my post was to say that this is NOT the way to get it. You can easily do yourself what I did, just download CM10 for the Y300 from this site and merge it with stock of your choice. But unless you know more than the noob guides tell you, it's not going to work.