I have been trying to create my own customized distro of Linux (preferably some kind of Debian system like Debian, Ubuntu, Knoppix, etc). I want to make it specifically for playing games. This is just a pet project for me and while I know Linux pretty well (bash, gcc, g++, gdb, etc), I'm not that great with knowing the kernel. So that puts making my own distro from scratch out of the question.
I went on to trying to create remasters of Knoppix and it worked for me but it was a very long process since knoppix is meant to be a live CD and I was running it in VirtualBox. So what is the easiest and fastest method of making your own distro?
Also, can I install Ubuntu or some kind of Linux to a computer make changes to it, and then make a distro off of that installation?