So I searched for a suitable model. I finally found one in a Undead Giant model on ebay and bought it right away. This is how the basic model looked like.
After the first cuttin and plastcard session he looked like this. I think we're gettin closer.
First GS part contained the filling of the gaps on his Head and the Flesh skirt.
Followed by making the sword.
And finally I made some damage onto his head with a dremel tool. Mainly I did it to break up the flat and clean surface.
Now he was ready for paint job.