The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft. Zenith Aircraft considers the G1 an unauthorized copy of the Zenith STOL CH 701. The aircraft is derived from the Alisport Yuma and was designed to comply with the Fédération Aéronautique Internationale microlight rules. It features a strut-braced high wing, a two-seats-in-side-by-side configuration enclosed cockpit, fixed tricycle landing gear and a single engine in tractor configuration. All G1 models have a fuselage made from welded steel tubing, with the wing made from aluminum, all covered in doped aircraft fabric. The Gelinotte variant has a 9.9 m (32.5 ft) span wing with an area of 14.80 m2 (159.3 sq ft) and features leading edge slots. The SPYL model uses vortex generators in place of the slots, has the same wing span, but a slightly smaller wing area of 14.27 m2 (153.6 sq ft). All models are equipped with flaps and have optional folding wings for ground transport and storage. Standard engines available are the 60 kW (80 hp) Rotax 912UL and the 75 kW (101 hp) Rotax 912ULS four-stroke powerplants. The company also offers a new exhaust system for the Rotax 912 that is quieter than the stock Rotax-supplied system. The aircraft has also been equipped with the JLT Motors Ecoyota engine.
