tackyrama , I have to tell you something. You have accomplished a task that you should be extremely proud of! I am proud of you for the methods and manners you went through to construct it.
I have just bought some land with a couple of older houses on it, two barns, and a shop. Then I have a nice pond and timber that I plan on cutting to mill myself like you did to build a new shop so I can use the old one for my new coop.
Since you have been doing this a bit, I posted earlier a couple of pics of mine for folks to help give me some ideas. It's under coop plans & building section.
Now the wood chips part. Sorry to get off track, but I was really impressed with his coop folks. Hardwood chips will mold a little easier than softwood chips will because of the rate that they hold water and takes a little longer for them to dry out. But, on the same token, it takes them longer to absorb moisture as well.
I don't think you would have to many issues with them unless you have a lot of excess moisture hanging around. I have used hardwood chips for years when I was working on the horse farm and I don't really recall any mold issues.
Good luck!