If you go the bar on the left and scroll down to "other info" you can see where they and their many volunteers transcribed the Camp Chase letters. They might be interested in helping you with yours- one can only ask. Sounds like you have a treasure trove!
One thing I found with 5 letters from one of my civil war ancestors. I scanned them at a high resolution and sometimes you could pick out some faded letter/s or the letter that is now under an ink smudge. Sometimes enough to help determine what word/s could not be determined from just reading the letter. It isn't perfect but it was a help.
Rhonda Raye