I now added some comments so hopefully the code is at least a bit more understandeable (still far from perfect, i know)
Repository
There are no normals even though it wouldnt be hard to generate them if all triangles were facing the right direction (implied by vertex ordering) which is not done yet.
Meshdrawer doesnt seem to support normals anyway so for supporting normals the (much) more verbose way for gemoetry-generation must be used which wouldnt make the example more readable.