Upon review of this challenge I have concluded that it is too obscure to be found. There is next to nothing on the internet to aid sleuthing and very little info available. In order to revive this thread I declare open house.
Lithuanian "Homebuilt" Kensgalia VK9
I was surprised that no-one spotted the obviously Russian instrumentation though - that yellow centred one is unmistakable and the chaotic flight instrumentation layout is surely not Western.