Thanks for pointing out there were still more paper models linked to the site I had posted. I just downloaded the cheugugi (rain gauge).
I found a link to the cheomseongdae observatory (I cannot tell you how I did it other than that I randomly clicked everything until I had lots of open windows and my computer was almost frozen.) Navigating a Korean page is even odder than trying to get around in a Japanese site. There is a lot of Java script and "hidden" buttons.
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It looks like it is a pay model.