Great looking model. Didn't know there were any high hood GP40's. One thing before you paint. Look at the fan housings,they are reversed on the Aristo model. Should be lower one on dynamic brake and taller on hood end. Your prototype photos show it pretty clear. I have brought this up before on the Aristo forum about the SD45 and now the GP40. I believe most prototype locos are like your photos. I have reversed them on all my SP kitbash's.
Very nice engine, I am a High Hood friends, would you tell me where to get the "High Hood", as my know, Aristo only produces low hood GP-40, does the HH come from a SD-45? I am also detailing and weathering a HH NWSD-45 now, almost finish, looking forward to see your finished probject.