Zulkarnain, whilst I am used to "Mr Steev" or "Mr Stiv" from my trips to India, It would be better to call me Steve, and Harald probably prefers Harald. (perhaps you are using a mobile device and it's autocorrecting that way?)
It may be best to google "How to create a spice model" and get some background. I can't actually help you do this, but I am aware that it is not a simple task.
There may be others here who could be able to help you. (I don't know)