They are not in IN but out of OH and they probably have what you are looking for. I bought my Dad a western holster for his 1873 cattleman from them. It is a really nice holster and belt.
You might want to try LFL Home Page He makes custom holsters. I would imagine that he could handle a project like yours. He is in Jeffersonville, Indiana.
I have a hobby making things. I don't do leather, but if your father-in-law is tacticool, I could make him a custom scabbard from Ranger Green Cordura.