Yes you can do this with customisation You can use product attributes to enter the width and height Then you use a custom update function to calculate the price Later when the product is added to the cart you use another update function to calculate the correct price
It is possible to achieve what you're looking for with a custom plugin. I'd be more than happy to assist you with this and have sent you a message. Kindly check your inbox and let me know your thoughts.
Yes, that is possible for sure with custom plugin. We can assist you on this as we have nopExperts and we are with nopCommerce since 2.65 version to till date. We will give effective and affordable way to do this.