It was a lot of fun for me. I did it without a virtual machine (would not generally recommend) on a older laptop I wasn’t using anyway. I wasn’t very successful in the end however. My own built kernel couldn’t produce any vga output. I tried to fix it for a handful of nights, but in the end gave up and called it good enough :P So I might comeback to it later to fully complete an installation.
But it was good learning oppertunity. It showed that just compiling a version of the Linux kernel isn’t very complicated. It even comes with a very nice TUI to select your build options!