I did not try adding xfce to the Light install and rather installed fluxbox and customized it. if xfce is available you will find it in the gslapt package manager. update the package list after install and search xfce. it will not be customized like the std version as you may expect, but likely possible.
If the d600 has the same spec as my d400 you may find pae the issue and will have to search for non pae distros. I tried several at the time like xubuntu and solydx but not everything worked out of the box, so I was happy to find Vector Light worked perfectly and is still installed at the moment. My answer for the STD version with xfce was to install to a pae complient computer. perhaps I am off base or mistaken...just my experience with the d400 as I recall it.