Asuming you have yet to buy the Dome, why not consider building similar? I'm sure it could be done, and for much cheaper. When living out in Greece I made a fire pit-***-bbq from an old washing machine drum and it cooked blazingly good and I "domed" it using a hacked out old lid from a disused Webber. Not only was it windproof but also, any trapped heat really made short work of any difficult cheap cuts of meat. Also I used my homebrew for a smoker.
Have a think about it. :)