Dixie Gun Works has reproductions at much more reasonable prices.
Reasonable indeed. At $45K.

Nevertheless, if i had $45K I might still be in the market for such a beauty

You realize, don't you, that the paperwork for a Gatling is the same as for any other long gun ?
They are not an NFA item. 
Lucky you! In Holland these things are considered to be full automatic weapons. Have one of those in your home and the cops won't even bother to arrest you: they will take you to the nearest woods and summary execute you!

Ocin