FWIW I recently bought a 180 birdman and it applies the same theory as I did with my board. Its a normal board with an extended nose, you dont lose out on normal riding performance to have the powder nose. Its the best of both worlds if you can handle the length, for me its no problem at all.
Now you have me thinking ETM! I'm headed to Myoko Feb 15. You are likely to still be testing your designs at that time. Im currently riding an Arbor Roundhouse 162 but very keen to get on a pow deck for my trip. Gentem's are just too expensive. Beautiful boards; hats off to Taro Tamai, but I can't shell $1500 at this stage.
Bloody snowboarding...gets us all too involved!