Bill,
I don't know if anyone suggested this option or not. To insulate any "bullet" shaped cooker. Purchase a 4x8 sheet of rigid styrofoam, a second if needed, cut 4 pieces to create a square/box open at each end. They can be glued, taped, together. Leaving a gap of about 4 inchs all the way around. This creates a great wind stopper and insulates, but allows air flow to occur. Then, simply lift off to fuss with the cooker if need be. I think they even make the rigid styrofoam with a side aluminized which would reflect infrared energy back at the cooker. As long as the aluminized side was placed inside the "box".