3. Are there not any specific requirements on an RAA aircraft flying into controlled aircraft one needs to have? or once you go through a successful RAA aircraft registration process this will ensure you have everything? Another way to ask this question, if you were looking at buying an RAA aircraft anything to validate to ensure it can fly in/out of controlled airspace?
Anything raa long as it’s factory built and approved; usually with 4 stroke engines.
Gazelle, Skyfox, Lsa55 Jabiru, j230 Jabiru, Foxbat, Sling, Sting, Sportstar, etc.
It needs to have the transponder and static checked by LAME every 2 years, however otherwise it can be owner maintained.
*note some of those are available as home builds, but not suitable in this case.