I would think that you would be starting your project with a copy of "PERSHING" by Hunnicutt in front of you, because it carries most everything you want.
Lots of great hi-angle photos for reference, and 1/48 scale plans for:-
Medium Tank T23, Pilot Number 1
Medium Tank T23, Pilot Number 2
Medium Tank T23, Production Model
Medium Tank T23E3, Pilot
Medium Tank T23 HVSS
Medium Tank T25, Pilot Number 1
etc, etc
Steve; I have the Pershing book. If you give me some time, I'll be glad to get mine to a fax machine and make some copies for you to mail. Let me know in about a week or so, if you are still in need, what you want, etc and reply with a mailing address. I'm currently home with a twisted ankle doing physical therapy (read 1/48th Plastic therapy) and enjoying every minute of it. Chris Schwach