> Just to add to this and help you find out if your model is
> joined and to find open/unattached edges, there is a script
> to highlight these 'naked' edges that you can assign a
> keyboard shortcut to.

Thanks so much for the script Danny. This one is a definite keeper. I ran it on the pre-booleaned version of my hull (definitely successfully joined) and it found a missing (very tiny) surface. Brilliant!

Regarding the "Brians" moments, this is one of a small handful of forums I visit where there really are no stupid questions. I make a point of using the search and more often than not I find a post that gives a solution to a question I was about to ask. When I can't, there are great responses like these.

Thanks to all!