Ultimate Boot CD

I have followed Spalmore's post to try to integrate SystemRescue CD 1.3.5 to UBCD 4.1.1. It looks very easy, but once I reached step 5, I've got a warning stating that I was about to overwrite isolinux.bin.
Should I?

Thanks very much to you, Victor Chew. This looks exactly what I was looking for : short and simple! I gonna give it a try, but I'm very confident.
CU

Hello everyone I'm quite a newbie in customizing UBCD and I'm facing some difficulties that the posts I've read did not answer. I've downloaded the latest 4.0 version and I'm trying to integrate dsl on it. The problem is that I did not manage to find information that speaks to me! Usually, tutorials...