[8] The FAA's National Kit Evaluation Team has approved construction checklists demonstrating compliance with the homebuilt requirement that the "major portion", or 51% of the aircraft, is completed by the builder, not the manufacturer.

[4] In a February 2, 2011 webinar, Monett discussed many of technical aspects of the Onex, as well as providing a description of the early flight tests.

Monett claims that this type of tank is the safest and placing it in the fuselage, as opposed to in the wing, will reduce the chances of a fire in case of an accident.

Monett discussed the aim of simplicity and that a major goal is to reduce the parts count and thereby cost and weight.

[7] In a progress update on January 26, 2012, Sonex stated that more than 50 kits had been shipped before the new year, and some were nearing completion.