Thanks for the reply. Unfortunately I've made it that far successfully, but no farther. I can't seem to actually use drush the way I'd expect. For instance using the same full path call you used followed by a command to install a module fails. I have this in my OP as follows:
However I cannot seem to do anything with it...
drush sa shows only
drush en rules gives
Command pm-enable needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.
Are you able to perform an en or other drush task without additional steps?