SKU #'s Can someone help me to understand if what I'm thinking is correct.

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I sell 6 sizes of a product   All with different designs  I do not track inventory because they are all custom made.

So I have each design set up as a product and the sizes as a variant.  Can I keep the sku # the same on each product
Size 1
Size 2
Size 3  etc.

will doing it this way allow me to discern what's being purchased in the order confirmation  will it help me to keep track of how many are sold of each size.  I'm not concerned with what design it is, but I want to make sure that I will know which design to make if the design is not part of the variant name etc.

Can someone who has the experience with this type of flow give me guidance.  I just want to be able to see the big picture of how doing it will effect the big picture that I cannot yet see.

Orders,  Tracking Sales,  Posting to a facebook / instagram etc etc  (and then possibly taking it in to a customization app where the shopper designs it themself (at a much later date but I don't want to have to re-do them all later.)