Terry,
I don't really know enough about Fort Beauregard that I could discuss it in detail. I know that I've come across a lot of references to it, in the Official Records (both Army and Navy) and other sources that I've come across over the years, and I know there is an article that appeared in a Louisiana Historical Quarterly many years ago about the fort, but I can't get more specific than that. I think you're going to find that it's like Fort DeRussy was - the information is out there, but it's in paragraphs and sentences scattered from here to yonder, and no one has ever gathered it all up into one place. That LHQ article would be a good starting point, and I'll see if I can't track down the specifics on that.
Steve