These are fantastic articles. I've compiled a 40 page document from various YouTube videos including Justin's. I have referenced multiple official Microsoft documents on top of the videos as well. Nowhere did any of those mention anything about your Step 5 Configure Trusted Root Certificates. I even went back to Justin's video to confirm lol. So, thank you for that. I have updated my documentation to include this particular step.
I do have custom boot images as we use Adaptiva. I'll have to update it with the OSDCert.crt manually. They provide a wonderful powershell script to accomplish this task.
Thanks for your work.