I took some time this week to update William Lams Nested vSphere 6.5 with NSX-T to Nested vSphere 6.7U1/NSX-T 2.3.1, to kickstart a new customer project.
This version updated some of the vCSA OVF JSON fields, and added support for PowerShell 6.1. It was tested against PowerCLI 11.2 on a Windows 10 machine.
The original post can be found at virtuallyghetto.
You can find the new, updated file(s) at nested-nsxt231-vsphere67u1.