@Double Misfire @TheOtherJosh Thanks! Glad you guys like it.
It is indeed made with bits from the Glottkin and Maggoth Lord. I thought the glottkin and maggoth lord parts had the potential to make a blobby, monstrous Great Unclean One so I ordered the bits. As I had to wait quite some time for the bits to arrive I started photoshopping my GUO together (something I never do actually). When the bits finally arrived I just created it in one go without that much thinking and planning. Apart from the mentioned bits, there are pieces of plaguebearer bellies, a Blightking torso and some green stuff.
I wanted the "flow" of the model to start bottom-left and going upwards to the top-right. Thats why the top-right is quite busy with all the horns and the positioning of its arm. The asymmetric horns also fits the Nurgle theme I think.