My search-fu fails..

Looking for an pure assassin build. Kopheshes required.. all my Greensteel is in Kophesh form.

I would like to have a decent assassinate DC, and lean on STR over DEX. I feel this would be to easy for me to mess up later on.

Past life Fighter, but Im not sure that matters to a rogue.

The only pay race I have is Drow unlocked, but I like human right now.

Anyone have a build they can point me too?