Good to see that someone decided to invest the money to update the boats.. Apparently you can make the changes and still run a trip. The best method to judge the changes will be on the boat with someone who knew the previous layout. Regardless of the boat design or history, 30+ people on a boat is still quite a bit so they still had a tall order to make it safer..
<<Skeptics coming with an agenda to fault-find might attend this 'open house' and post complaints, feeding into 'fear, uncertainty and doubt,' discouraging bookings before trips are generating positive reports.>>
I think that is the wrong attitude to have because that is essentially what got them to the tragedy i.e. as long as the diving was good, they ignored the safety issues. It shouldn't be difficult to defend the changes and if it is difficult to defend that means more improvements/changes have to be made. A good trip and safety aren't mutually exclusive and hopefully the new design can pass that test.