Get some photos for a guide, and scratch build it
with a quick search this is about the closest thing i could find. http://www.besttrains.com/products_1071.html
The hip roof style is a little unusual. I noticed a couple of roughly similar strucures on this site, which offers plans for sale. I have never seen any of these plans nor do I know of anyone who has used them, so caveat emptor.
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Photos on this site http://gratiot.us/Interesting%20Facts.html
I tried to sell my two cents worth, but no one would give me a plug nickel for it.
I don't have a leg to stand on.
During a "whistle stop" (or rather, pit stop in modern terms) made in Gratiot, WI on a trip last year, I found an old depot that seemed to be in pretty good condition. Found purely by accident (as my kids needed to run out some energy at the park in town) It is slightly northwest of the only gas station in town on the Cheese Trail (old railway line) and easily found via Google maps. I am looking for an equivalent in HO scale. Any ideas on where one can be found or kit available now or in the past? I enjoyed the vacation quite a bit and especially the surprise find of the station when I stopped there and want to preserve a memory. Stand in would be fine. Plans to scratchbuild would be good too.