We have a business that sells custom items that have about 10 different parameters.  ie. length, width, etc…  Also, these items are generally only made in one batch and sold once. 
    The way I see defining an item is as follows: 
  A custom record stores all of the specifications for a particular item.  After the item is linked to the custom record through a custom field.
    Does this make sense?  Is there a better way to do this?
    Also, there will be a negotiation process with the manufacturer of the item (vendor).  The vendor must accept to build the item and propose a price.  The way I see this is as follows: