Nice pictures!
Looks like a 830E-AC. Never been to the Peoria facility, would love to go.
Complete assembly time was just a few days but you have to remember everything comes in as assemblies. Number of people in assembly....if I remember right it was about 20 give or take a few.
Oh, forgot to mention it in the last post, but that super long building that Komatsu is in was built by R.G. LeTourneau back in the 1930's. He said in his book how they built it 300' long, then when they were done with that they added another 300' to the one end, then another 300', iirc its around 1,200' long now.