Thanks to Aleksandar Samardzic who have uploaded SlackBuild script for E17 in SBo along with all of it's dependencies. Many people definitely thanked him for doing this, including myself. I got a chance to try this desktop environment and now i have an option besides KDE and XFCE which still being used on my machines.
I used his SlackBuild script and modify it a little bit to upgrade the package to the latest version (0.17.1) which is a maintenance release, so it should be safe to upgrade. E17 itself composed of several supporting libraries, so before attempting to install/upgrade enlightenment, you should make sure you have installed the libraries first.
Besides upgrading to the latest version (1.7.5), i also added three new libraries that aren't available on SBo. They are eeze (library for manipulating devices through udev), ethumb (thumbnail generation library) and emotion (video and audio codec API). I have pushed them to my SlackHacks repository under a new directory called e17.
Have fun with E17 and let me know if there's a problem with the SlackBuild