It's quite easy to do some simple conversions to get this, as the clunky nature of the marines begs conversion. So you might notice some head-, weapon- and backpack swaps. I've also made sure to drill out all weapon barrels.
I'll be making all the squads 7 man strong (Nurgle's holy number). It might not always make the most tactical sense in the game, but I always play for the rule of cool.
The entire 1st Squad in all its rotten glory.
The champion in this squad is converted from a Noxious Blightbringer. He's had his bell removed and the large horn re-arrenged. The powerfist is added from the original Champion and the plasma gun is from the bit box.
I've gone with a blue glow for all plasma weapons in the army, for easy identification during gaming.
Check out the entire Death Guard army project here.