Thanks for sharing this, I've never heard of it! It's actually a pretty similar approach to what I'm doing, without having dug into the code. Making an ssg does feel like you're reinventing the wheel, but I rather enjoy having creative control over things even if it's not much different from what's out there.

I just started working on my own ssg using Elixir https://github.com/Sieep-Coding/project-ssg

Here's a sample using our 'minimal' template https://project-ssg.vercel.app/