Well it works for me, but when i want to apply the plan in build mode my ship just blows up.
Edit: I tested the website and let it make a 3x3x2 cube and put that through the converter still same happens ship blows up. So i think it is not the website.
Edit2: Well I found the issue when it gets out of the converter lower/upper xyz values might have a 0,5 1,5 2,5 etc. value. If you change this to a round number it works for me.
Edit3: It worked