Put together this one tonight on an impulse. I’m guessing this is pretty similar to the Tycobrahe Octavia. I’m thinking the diodes should probably be matched for best effect, and I’m unsure about the orientation of the drive pot so you might have to re-orient it (let me know and I’ll update the layout).
Update (15.01.2013): Already verified thanks to Alex. The drive pot was reversed, but the layout has been updated.