The solution for the border issue will need to be unique. It cannot pre-configure the future relationship between the European Union and the UK. It will require both sides to be flexible and creative. And what I see in the UK's paper, An Island Unless an Island, worries me. The UK wants the EU to suspend the application of its laws, its customs union, and its single market as what will be a new external border for the EU.
And the UK wants to use Ireland as a kind of test case for the future EU/UK custom relations. This will not happen.