I have always found this aircraft to look... odd. Actually very odd. When I first saw pictures of it I thought they were Photoshopped. However, the design is in fact driven by needs and quite ingenious:
Roger Young,
PL 11 Airtruck Documentary ZK BPV MP4 (28 min, published July 1, 2015)
There are some interesting additional notes by the uploader in the comment section.
Apparently the uploader is related neither to Geoff Young, who took over when Luigi Pellarini and Snow Bennett had left development, or Jeff (Jeffery) Young, they just all happened to have the same last name.