The Boss Man
For the bionic arm I had ordered Ghazghkull's arm, which was a perfect fit and posed to match my Lord figure. I used a little greenstuff on the Prince's head to create skin edge so that half of his face was bionic, again to match my original Lord figure.
This Daemon Prince model has gone on to lead my Iron Warriors in many tournaments since, including several GTs. His bark was always worse than his bite, and his perceived threat (especially sitting behind my line of guns) has been a very successful tactic against all but the cleverest of opponents.