Well, the point is to learn how to build an engine with modern capabilities (those that you are supposed to use with C++ like namespaces, methods, ECS architect

Well, the point is to learn how to build an engine with modern capabilities (those that you are supposed to use with C++ like namespaces, methods, ECS architecture, networking...), SDL is just a tool to not having to write the whole window/input/media/opengl logic from scratch. I could write a SDL tutorial and make a game in 3 hours; it's not as interesting i think, for me the objective is not to write a game but to explain how engines works and desmitify them a little :S But you are right, it'll take a daaamn long time. I've the third and the forth parts almost ready, covering the engine architecture itself, the private scene scope and the image->texture->sprite stuff but i havn't started yet with ECS, fs, configurations, physics, networking... this field is really extense.