When I was looking at which smoker to buy, the deciding factor was space. I entertain alot and didn't want to ever wish I had more room. I don't fill it up too often but I regularly cook on the middle rack with a pan under it to help with keeping it clean. As far as fat cap I've always run fat cap down to protect the meat from the fire pot, this is a first. I'm hoping that the thick steel of the Heavy D will protect the meat and by having the fat cap up it will keep the butt moist as it renders down.ill let you know how it turns out. I'll be smoking a couple hams for Easter, thanks for sharing your results on your test run. I think that's the plan I will go with.