Hi Tony
Welcome back, and thanks for your comments. Yes there are still gaps in the builder info, but the site owner, through his ship xplorer software is now able to add new data. In the mean time efforts are ongoing to make the Gross Tonnage database accessible and reintroduce data manually. As this is a delicate process, it will take some time before that will be fully operational.
In the there was also the issue that for ships that were built in say the fifties by a certain yard, the current name of that yard, if still existing, was given, which caused some confusion. There it was decided to drop the yard data altogether to avoid a continuous flow of comments, about something that we could not change.
Hopefully times will change soon, but the beginning as you rightfully now enjoy, is there.