The mouth looks like much larger then 80hz, I can see whole 40hz in there. The length of this horn however is more like 80hz. So, are doing to go there at night with a blowtorch, cuter and a damn track?
BTW, I took liberty to follow the link to your galley and came with the following?
I think this is much more interesting. Can you share your impressions about this project? Was it a part of the barn conversion ceremony you discussed a few year back?
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche