compatable birds

hi we have a variety of conures (patagonian, blue headed, sun conures) alexanrdian parakket, maximillaina and amazon parrots in pairs in separate aviaries. at present we are building a walk in aviary to house them so that they are accessible to us and visitors. our question
   
1. is which birds will be compatable together?
   
2. we have paw paw and mango trees already in that area do we cut them or can the birds use these trees to play and nest etc.
   
3. can we be directed to infor for a walk in aviary?
   
thanks