Shopify App Development - Product Personalisation (customer driven)

We plan to establish a Shopify store that offers customers the ability to design their own charm bracelets, necklaces and anklets. They will select components - a chain of their choice and up to 6 charms - from our wide range of options. When combined, the components will form a single product. When designing their product the customer needs to be able to make changes easily - either swap a component for another (chain or charm) or delete (charm only). An image of the final product (showing all components) to be displayed before the customer approves it and adds it to the cart. Once added to the cart, the customer needs to be prompted to design another product. When a purchase is made we need to be able to see each product and all its components listed separately, eg Product 1, 2, 3 etc. We'll then make up the product/s, pack and post them. This app must integrate with Inventory Management. It's vital that the customer's design and purchasing experience is easy, quick, trouble free and fun. I hope that's enough info to give you an idea of what we want to achieve. Cheers, C