Answering your first question, yes it is absolutely possible to have one installation of WordPress running ‘within’ another (i.e. installed at example.com and example.com/child). I have something like that running right now.
Answering your first question, yes it is absolutely possible to have one installation of WordPress running ‘within’ another (i.e. installed at example.com and example.com/child). I have something like that running right now.