Later near a month of reflection, and after consultation of Frere d' Arme and Drone84, I have just made an important decision:
The main reason is that I cannot make what I want with this engine, because of its age.
Wilson Chronicles: The Second Encounter, as for him, continues to exist and become Wilson Chronicles.
I am thus anxious to remain clear on this point: Wilson Chronicles is not dead (he is even far from the being, as you can see on the homepage of the forum)).
Thanks to all and goodbye for the release of the Source Engine mod ;)