The LO-120 was designed to comply with the Fédération Aéronautique Internationale microlight rules. It features a cantilever high-wing, a two-seats-in-tandem open cockpit with a small windshield, fixed tricycle landing gear and a single engine in pusher configuration.
The aircraft is made from wood, with its flying surfaces covered in doped aircraft fabric. Its 15.51NaN1 span soaring wing has an area of 16m2 and can be quickly swapped for an alternate, reduced span microlight touring wing that increases cruising speed. The tail is an inverted V-tail mounted to twin booms. The standard engine is the 400NaN0 Rotax 447 two-stroke powerplant.
Cockpit access is via a sliding fairing.