Automate YouTube-Inspired Video Creation ( Build an AI Video Automation Workflow (YouTube → ChatGPT → Pexels → Shotstack → MP4 Save

I need a full n8n automation workflow that automatically creates videos based on a YouTube channel.
Here’s exactly what I want:
1. I’ll provide a YouTube channel link.
2. The automation should detect the most popular video on that channel first, then continue with other videos (from newest to oldest).
3. Every two days at 6 PM, the workflow should start automatically.
4. It should:
• Analyze the YouTube video (title, description, and style).
• Use ChatGPT API to generate a new 8–10 minute video script in the same storytelling style.
• Download related stock clips from Pexels API based on the script context.
• Merge and edit those clips using Shotstack (or similar) API to produce a complete MP4 video.
• Save the final rendered video to my computer (local path) or cloud (Google Drive or Dropbox).

No voiceover or subtitles — only visuals.

This automation should be modular, so I can reuse it for different YouTube channels later.
If possible, all nodes (API calls, triggers, schedules, file handling, etc.) should be properly named and documented.