I have read that PDF before but I read again and all it says is the same thing I stated before. Of note also in this PDF is: "I. Scope of FAA’s Enforcement AuthorityAs discussed above, if a model aircraft is operated consistently with the terms ofsection 336(a) and (c), then it would not be subject to future FAA regulations regardingmodel aircraft. However, Congress also recognized the potential for such operations toendanger other aircraft and systems of the NAS. Therefore, it specifically stated that“[n]othing in this section shall be construed to limit the authority of the Administrator topursue enforcement action against persons operating model aircraft who endanger thesafety of the national airspace system.” P.L. 112-95, section 336(b)."
So again as long as we follow the AMA code we are good. nothing about 400 feet or anything. The 400 feet is just a guidline not a law and not even a regulation.