How to create products with unlimited variations in Woocommerce?

I need to create a store with basically unlimited variations of a product AND many of these products in one cart.
Example:
Let’s say I’m selling metal bars. The customer needs to pick the material (choice of 5 options), the length (range from 50mm to 5000mm), the width (different range from-to) the height (different range from-to) as well as the finish (choice of 10 options).

Now I have 2 questions:

1. How do I code the range value rather than a preselected value?
   (I think I can generate a custom field, right?)
2. The customer needs many of these items in one cart.
   Let’s say 5 different metal bars, all customised. But Woocommerce won’t allow multiple products of the same type in one cart.

Please help, I’m completely lost!
Is this even possible?