In late 2019 / early 2020 we migrated DLT’s Drupal 7 site to Drupal 8, maintaining their existing look, feel, and functionality, but improving the functionality. In order to maintain the look and feel we had to build a brand-new Drupal 8 theme and make it look like the old site.
We also migrated their WordPress blog into Drupal, ensuring proper redirects of old URLs, in order to avoid SEO problems.