DNN Web Shop Modules

I want to create a web shop for my business in the .NET Framework. We build flight-cases for musicians and companies to protect their equipment. This web shop will be an extension of our current business. The goal is to also send the individual parts so that customers can build these cases themselves. These materials have a big diversity. Corners, latches, hinges, aluminum profiles, and off course the wood panels. The special thing of a web shop for this kind of business, is that I want the client to be able to provide the dimensions of the wooden panels. So that we can deliver them custom made by the dimensions provided. These dimensions are simply calculated by square meter. (Width x length = m²). The price of these product item will be configured in m², and depending on the dimensions entered the price is calculated, and then can be added to the Shopping Cart. The default Store module provided by DNN has limited capability. The store module needs to be enhanced and other data for products, taxes, shipping rates, billing and discounts needs to be added. See the attached PDF for more info