Hi Kevin,
I can help a little bit. I have been researching Minneapolis Naval Air Station. It changed from NARB in late 1942 or very early 1943 and then back to a reserve base after the war. I am not positive of the dates because I left the book at work. This is all in connection with restoring one of the Bush Stearmans. You can see photos here:
http://www.projects.aircorpsaviation.co ... buno-3347/This book will be useful for you for the Minneapolis base: "United States Naval Air Stations of World War II: Volume 2 - Western States" by M.L. Shettle, Jr. it is still available here:
http://www.amazon.com/United-States-Nav ... B94BB8916AThere is also a volume 1 of the eastern Naval Air Stations that probably has Gross Ile in it.
The images in those books are copyrighted so I won't post them but will send in a PM. There are no NP-1s in the Minneapolis photos but I know they were at least there in late 1942 because George HW Bush wrote about his very first flight in any airplane in a letter home and that was in the Spartan.
This website is entitled Gross Ile and has photos of Spartans , at least one of which appears to be at Gross Ile:http://nasgi.net/np1.htm
They are protected against copying so I can't post those either , or at least I can't figure out how.
Check for a PM
Chuck Cravens