You will have nothing except troubles if you will use such way. Why don't edit aMember templates to include everything you want? It allows to include even PHP files to template - http://smarty.php.net/manual/en/
No. Instead of include aMember pages somewhere, you must make aMember pages looks like your site. For that, edit templates - template language is very flexible.
Ok Ta. One last question! I downloaded the aMember files when purchased, and had you install the scripts for me. Are there any settings within the template pages, i.e. are the virgin files the same as the ones you installed? If they are, then I can just use local template files and overwrite the ones you installed. Cheers Terry