contact my cousin Henrym. I am not sure if he is still on the forums or not since I haven't seen him around lately. He lives in Kajaani and could probably tell you where he gets his wood for builds.
I cut my own lumber up here in Minnesota which is a lot closer than Finland ... I take that back I did get one 10'x2'x2" board of mahogany for free once but other than that I use birch, walnut, redpine, oak, basically whatever I can get my hands on and that my saw will take care of.