Need to find a very overweight action figure

Posted in Custom Workstation

So, it might sound weird, but I'm looking for a fat action figure either in 4-5 inch range or 6-7 inch range. If you're familiar with the game DOOM, you might know about the mancubus. He's a big grotesquely fat demon with rocket launchers for arms. He's my next project but I'm having no luck finding a good base figure that has that type of body shape. I was thinking something like the blob but he's really expensive. I'm also looking for good arm articulation. And I really just need an upper body since he has stumpy legs that really won't need to move. Help would be greatly appreciated if you can tell me about any figure or character that fits this description.