Makes me think of a "drunken night of joy" between a Aerosport Rail and OV-10Roll over protection? There's room to lower the seat a little and put a little back rest on it. Something just tall enough for the shoulder harness, maybe a small roll bar on top of the back rest.
Maybe call it the "Bronco" because you sit on it like a horse and it kind of looks like an OV-10.
AND that three piece wing could be made out of easy to find material lengths...Great idea for a simple ultralight, with a 3 piece wing, say 7’-8’ centre section (out to tubular booms), 8’-10’ outer panels - could be legally trailered and kept in a shipping container or standard carport.