Woocommerce Wordpress product measurements - repost

I am creating an online store for a client and the site has some requirements that available plugins just dont cover. I am looking for a solution for this Online Flooring Store: [login to view URL] I already have installed the Measurement Price Calculator but it doesnt work quite how I need it to. The customers need to be able to input the required sq m (square meters) into a box, the website will then return a price based on the price per pack of flooring and round up to that sq m (square meter) value. For Example: I sell Laminate flooring for £10 per square meter, a single pack covers 2 square meters and the customer requires 12 square meters. They input 12 square meters into the box and it tells them they need 6 packs which is 12 square meters at a price of £60 + vat Some of my other flooring for example Carpet needs to be calculated differently as the customer chooses the Width from a drop down box for example Width = 4m the website lets them enter the exact length they require and it calculates the cost based on the product's price per square meter. A website that gives you an example of how this works is: [login to view URL] I also need a number of products to feature a button to allow customers to order a free sample, they will pay for shipping through the standard checkout process. They can only order up to 1 sample of 3 prodcuts in any one order. Kind regards Matthew