DT commenter ollie makes a fine point, that you don't have to be in Finland after all if you want a sweet, slot-together plywood playhouse. Modern Playhouse will make one for you and ship it right from the Scandinavia of America, Minnesota.
And the Puzzle House is even designed by someone named Svend Nielsen. Paint that thing grey, and keep the shades pulled for five months out of the year, and it's just like being there!
Puzzle Playhouse, made in MN, $650 [modern-playhouse]