Module for Prestashop 1.7 - Quantity Meters in 1 pack

Good morning, my name is Joel, I apologize in advance for my poor English. My native language is Italian, so I will give priority to web designers who speak Italian. This is just a small part of the overall project, so if I find good collaboration will probably go ahead with other projects. We are trying to create a network of professionals to work on several projects. I'm looking for an expert in Prestashop. Important: Do not use may be issues or parts of code covered by commeriale license. On the use of Open licenses you will need to anticipate what you want to use. In this case must be permissive for commercial projects and should not require a mandatory code distribution. webdesign must sign a release form which ensures that you have not used anything under commercial license and that all code and all rights are transferred to my company. Attached will be a copy of a document verifying your identity. I ask back even the invoice for your services. All payments will be made with freelancer.com, as well as all communications. I have no time to spend hours in Skype or similar. I describe the project in detail and you must rely on this. MODULE: The module will be used in a tile sales ecommerce. Generally customers order the square meters needed. The tiles are sold in packs. By Brand and type of each tile can pack contain a defined amount of square meters of tiles. he module will allow the administration panel: To add a product to the store by specifying the unit of measurement in square meters and the amount of square meters contained in a package. allow the customer to: Choose the square meters that wants to buy, Prestashop will automatically add the units needed to reach the required amount. The price must be indicated in large for 1 square meter, and the smaller the price for 1 pack. Example: the customer wants 100 square meters, the cost is $ 10 / Square Meter One package contains 1.5 square meter = 15 USD The customer chooses to buy 100 square meters, the system rounds to 100.5 square meters = 67 packs Into the shopping cart you will be specified the purchased product in square meters and below the required packages. Same applies for the invoice. Of course are welcome tips or extensions Payments will be made as follows: 40% after the demo in web 60% after delivery of the module