My latest sketches of an ultralight ended up assymetric because I wanted to fold it into an ISO 20 shipping container. Assymetry started with the horizontal tail to simplify folding. Then it was such a hassle cramming the pilot, prop, engine, etc. into a single pod, nacelle, gondola ... less than 8 feet long, that I displaced the engine and tail boom to the left of the pilot. That allowed for a crew pod less than 8 feet long and a simple folding scheme. When seen from the side, the engine partially over-lapped to pilot's legs ... without his toes catching fire.
So much like Topaz's candidate #2 here:In my concept the asymmetric tail was to save having to fold or remove the horizontal tail for towing or storage, so it would follow the same offset and 7' span of the wing center section. Just remove the outer wing panels, hang them on racks in the 20' container, wheel the rest through the doors, and Bob's your uncle.
So much like Topaz's candidate #2 here:
Conceptual Design of an "Inexpensive" Single-Seat Motorglider