Nice design. Dont sell it to other companies. Contact an engeneering firm that specialises into making custom metal pieces and ask them for the manifacturing price of lets say, 200 sample. You will need to provide them with CAD file extention or something more specific. Ask if there is anyone on the forums that can help you with this. The 3D concept you created is nice but maybe it doesnt follow technical constraints like bending metal/cutting type/price.
I can ask my friend if he can help you, he is a student at engeneering school.