Here is an classic Finnish biplane. It is an Finnish trainer aircraft designed and built in 1930’s. Approx 31 was built and this example is nicely preserved in Ilmailumuseo at Vantaa. For more planes at Ilmailumuseo check corresponding tags on right pane (–>). Walk-around pics of original, for model aeroplane plan see below.
For extremely rare vintage plan of this plane see here (51mb file). Preview below.
I went through old pics in my archives and stumbled on pics of separate Tuisku wing which was hanging on Ilmailumuseo wall. It is partially covered so you can see internals of wing.