Sweet! Birdman in Hakkoda! sounds like a dream! I went up there in Jan 2010 with a Neversummer Summit 161cm and a Travis Rice 157cm and it was a total blast. I especially like the run underneath the lift next to the hotel.
I'm planning to go to Hakkoda again this winter with the Atomic Sir Floatalot. Hope that's a good board to go up there with