All I have is the roster that was put together originally by Tonia Porter from her web site, "the silver trunk". It lists a brief history along with a company by company listing of soldiers with annotations of service. I can send it to you if you wish.
I would be interested in hearing about the letters you have and the travels of the regiment. While my ancestor was in a different company (Co. I), I would assume he had the same experiences that yours did.
You can email me direct at sabirge@digital.net
Scotty A Birge