Customer can build their bundle

[Mercader Virtual]

Hi,

• We have a candy store that should allow the customer to first pick up a box (where to put the candies in). Each configured box allows certain number of candies. So let's say we have 3 boxes, 1 with room for 10 candies, 2nd for 15 candies, and 3rd for 20 candies.
• This box should have attributes options like color and shape, so basically this box might be a "product with combinations". 
• Once customer selects the box and its attributes, she needs to add the candies, so if she selected a box for 15 candies, she needs to fill the box by selecting 15 products (candies) from existing catalog.
• Once the box is added to cart, customer can see in the cart the box and the list of each candy name. Customer can edit the list.
  
  The closest example I've found is this:
  https://www.sees.com/build-a-box

Please let me know how much you charge for this implementation.