Compiling KDE4 from source is quite challenging; it is in fact one of the tests that you may face in advanced linux courses.
Anyway I would like to ask you why would you want a fully fledged desktop environment on SuSe Enterprise Server?
If you are looking for a good desktop distro you can get much better, more updated and better looking distro for free.
QatQat
If I could have sex each time I reboot my server, I would definitely prefer Windoz over Linux!