once again, thank you all for your input
nevertheless, I would like to turn your focus on my question:
how should I manage the collaboration at this level/moment to protect my design and obtain prelimenary costs without making final agreement or confirming the order with particular company form China or Korea?
What legal procedure - if any - should I follow to make it(rough cost estimation based on my 3D model and 2D drawings) possible?
Engio
I though about rough model, however this would involve creation of new drawing with important to me dims and tolerances(part is big and tolerances will drive here primary role). At this moment I can not afford extra time for this.