donīt you only provide models to your partner who is the one who actually works with the engine?
No, it is not that simple. We are only 2 guys working on the games so we have to do much more than specializing in only one field.
But since I am a software programmer for about 20 years this is not a big problem. If you don't believe, here is the web-page of my software-company creating business software. You can also get our nutrition software there, if you understand German language: http://www.geppert-software.de