Idaho Centinal territory seal

I need an SVG file to create a 16 inch circle SILK SCREEN of the 1863 Idaho territory seal. There are many pictures on the internet but i haven't found anything that cleanly converts to a SVG file. Examples below.
The file Idaho Territory seal if the style and format we need. The horseback rider is an example of the application and the level of detail i'm looking for & the file named Idaho Coin has more detail if needed.
The one modification i would like to add are the letters KDG on the wagon in lucida calligraphy font