I'm sorry to tell you, but I'm not really interested in a new distribution. I appreciate the effort of what you are trying to do, but I think you are wasting time maintaining a distribution instead of maintaining patches (or a fork). If you have the know-how to patch those cancers out, then do only that and let other people do the packaging. Just make them known and available - a github repo maybe?

So, I'm not going to test your distro or switch from my Gentoo. I like Gentoo a lot, most of all because it's so very-very easy to patch any official package. Just put the patch in /etc/portage/patches/<package> and that's it. It gets automatically applied on the next install.

I'm using a Phenom II x6 1100 on a Gigabyte 880G. Firefox compiles in about 3-4 hours I think, not really sure. I do all Gentoo updates over night and it's usually ready in the morning. I can't say about Chromium or webkit - never used them - but 12h seems waaay too long.