Originally Posted by
Joda
Nope, that won't work. When you start with any aircraft (or part of an aircraft) that has been operated under any type of airworthiness certificate previously, you can't claim to be the "builder". There is specific language in the FAA order regarding this issue. Any work, (even fabricating new parts) for a pre-existing component is considered "repair" and not fabrication. You may be able to get some form or experimental certificate for such a project, but not amateur-built.