It’s a real shame he never continued that series as it was fascinating watching him take the whole process apart like that.
However he did release the source code, you’ll need Ogre to get that up and running to try it out.
For UE4 … That’s going to take some thought! I’m an Editor coder not so much a rendering guy
Lets start with the “QuadCube”:
You’re going to need a custom procedural mesh, there’s a Procedural Mesh Generation wiki entry about creating your own objects to generate geometry from code/data.
There’s also a forum discussion about how to actually use it
So before you do anything else, start by getting that example working, and then modifying that working example to generate a simple cube from code because that’s really the basis of everything that comes later.
If you want you can take a look at some old code I did that uses a QuadTree, it depends on the GLFW 2.7.6 and GLM 0.9.3.4 libraries (I haven’t updated it a year or two).
Break down the work into smaller pieces, ask for help when you’ve tried a few things and got good questions to ask, and you’ll figure it all out in the end.
It just takes time