Allowing a customer to create a product

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Hi all, I am developing a store that sells hundreds of products, each with potentially hundreds of variants. The items are sold by the linear metre so I have a selection box with sizes from 0.50m to 25.00m in 0.10m increments.

I would like to implement a way that once my customer has selected the required length and presses Add to Cart, that shopify generates a New product, essentially duplicating the current product but appending a unique code to the end of its description and setting a specific Unit Price for the piece.

I'm sure this is possible and I have read up on creating apps that use Post combined with Products.Json (and I have even successfully used Postman to create a new product), but have no idea how to implement this into my store as all the instructions seem incredibly complicated.

Does anyone know the easiest way to go about this?