I want to install KDE desktop environment in Backtrack GNOME 32 bit so that I can use both as per my need. I am very much acquainted with GNOME while I have started using linux so I like GNOME. But for my project I need to use KDE. However, downloading and installing BT 5 KDE will be very unwise. Can anyone please tell me how to install KDE and GNOME together in BT 5 R2 GNOME 32 bit.

I want the process to be like this:

1. Logging in backtrack through CLI
2. Then it will pop with a window asking for KDE or GNOME (I can choose whichever I want to)
3. Then it will take me to the my desired desktop manager.

Please HELP!!! I want this to be done anyhow