Custom products per customer

Hello

I'm trying to find out what the best way to handle this.  I sell custom products to each of my customers.  No one buys the same thing.  I want to be able to use NopCommerce but not sure how to do this.  Each customer must only see there products.  I also need to have them login before they see any products. What would be the best way to handle this?

Thank you

ACL on Products might do the job