This site is now using WordPress and no longer using the old Drupal 6 system.
It was not an easy process to maintain the old content! Took many iterations, trying it out a couple of times a year starting in 2014!
Creating a static drupal site.
Then in WordPress, created a plugin to customize the plugins being used and for general WordPress customization.
For example: hook into WP action to trap all 404s.
This was preferable to a .htaccess redirect since I wanted to first have WordPress check whether it had a link and then look into checking if the link was a file in the archived Drupal subfolder.
It is all done now, so migration is finally complete in December 2016.