That would be a great project, Shinpachi and the rendering is excellent, too!
As it happens, all the plans and most of the data of Heinkel's was destroyed when Heinkel's factory was bombed. The He100s that went to Russia and Japan (1 to the Navy and 2 to the Army) are lost to history. However, the Japanese did receive copies of the plans from Heinkel when a delegation visited Germany. Ultimately, the tooling and nessecary equipment for the Japanese to manufacture the He100 in Japan was lost.
So there remains the mystery: where did the 3 planes go and what happened to the plans that the Japanese possessed?