I heard from Dave Allen at Nordic Tugs. Thanks again firehoser75 for suggesting I contact him.
The walk through transom was an option on earlier versions of the Nordic Tug. Dave told me that they make a kit at the factory that allows you to retrofit older tugs. The kit is basically a walk through that you fibreglass into place. Sounds like a relatively simple process and allows a person to add this feature to any NT 32 that doesn’t already have this.