Hi Robbie,
Have you tried looking up Rhonda Kohl? She recently wrote a book on the 5th, "The Prairie Boys Go to War," and just created a new website for the 5th Illinois at
http://fifthillinoiscavalry.webs.com/ to share and capture additional stories and documents. Also, I have a site dedicated to my 3g-grandfather, Jonas H. Roe, and family which transcribes about 100 letters at
http://civilwarletters.150m.com/.
All the best,
Erik