You could go to a metal fabricator and have one made to your specs, and install a remote blower in the attic to vent to the outside. For example, you could have sheet metal painted aubergine, if that's your preference, in a texture to resemble cast iron. Or you could go with copper--now that would be a statement, although it's care might be problematic. Broan makes several remote blower fans. The advantage of remote motor location is that it is much quieter than if the fan were in the hood. Have fun.

Here are a few places to check out (if you haven't already):

http://www.rangecraft.com/
http://spectrumcopper.1485-3452-0.sites.ambinternet.com/productsByCategory.php?mid=10&intCatalogID=127
http://www.customrangehoods.com/
http://www.oldworldstoneworks.com/
http://www.wood-hood.com/default.asp?ContentID=233&FileName=hoods_custom.html

Hi,
Which AGA did you get? I am thinking about getting either the legacy 36" dual fuel or the 4 oven cooker. How do you like the AGA?
Thanks much
Carilee