Automating Deployment on OCP 4 on VMware UPI

Guys, running OCP 4.x on VMware UPI. Most of our infra is windows including DNS and DHCP. We mainly have windows servers and load balancers are a10.

OCP deployment in an automated manner is causing me headaches. DHCP reservations work fine for the nodes. But for the API and etcd entries I need to use powershell which to a degree is fine. For the external load balancers the a10s have a REST API but it's not documented very well.

Wondering what people out there are doing for:
- DHCP. Windows, Linux? What packages?
- DNS. What are you using and how are you automating?
- Load balancers. Automat HA proxy or Nginx or the like?

I also deploy to AWS but that's easy as all can be automated ! :)