Hi, all. In my own design musings I keep returning to the shoulder-wing configuration with one or two seats ahead of the spar as a great combination in terms of simplicity and visibility, even if it is often necessary to sweep the wing forward a bit to make the CG work.
A few examples are the homebuilt Andreasson BA-7 (which led to the factory-built Malmö Flygindustri MFI-9 Junior and the Bölkow Bo 208), homebuilt Viking Cygnet and homebuilt Pottier P.130 Bleu Citron (images of all three below).
What are the pros and cons of this configuration? Why don't we see it more often?