Christian,
Ian explained almost all important points in terms of displaying an Japanese armor. However, what I like to add is a thing about the haidate (apron). On most haidate of some age, the "belt part" turns fragile. So only one sturdy point remains commonly. It's the cord loop in the middle between the two parts. You can use it, to support the fastening and taking weight from the "belt". As a possibility, you can drill a hole in the bottom plate of the stand and insert a wooden pin. Thus, you have a mounting point to put the loop over.
Last but not least, I want to echo Jan and Malcolm. Avoid sharp edges and corners!
Enjoy!