This is an interesting idea. We are already implementing this idea together with @steemit-market and are nearing completion. Here is the announcement of the project: https://steemit.com/hive-102132/@steemit-market/witness-report-no-6 .But unfortunately I can't post that code. That's why I decided to create an open source online store. So that other users can copy my repository and make minor adjustments and open their own online store on the Steemit blockchain. I am glad that you decided to participate in the project and offer ideas. If you have any other ideas, please write to me, I will be very happy to discuss them. One head it's good, but two better.