okay I just thought about this and this is what I came up with, I installed kde with konstruct which is equaivalent to garnome for gdm.
So inorder to make my life easy, I determined the minimum packages for kde that will allow kde to work and they are[list=1][*]qt[*]kdebase[*]kdelibs[*]arts[/list=1]
I installed the above packages.
After compiling with konstruct, which put the kde folder in my home folder, I made modifications to .bash_profile and just reboot and log back in.
This above method allows me to switch been Fedora kde and konstruct kde just by editing the .bash_profile and commenting and uncommenting a few lines
So, basically copy these
export PATH LD_LIBRARY_PATH PYTHONPATH PKG_CONFIG_PATH GDK_USE_XFT XDG_DATA_DIRS
to your .bash_profile, logout and log back in
Note: I am not sure about the line
you might have to comment or un-comment this line to see if it works.
Hope this helps