Thanks. Yes Babylon.js & colyseus is amazing.
I’ll think about it, writing tutorials takes a tremendous amount time, and I’m not sure I have enough to do something like you suggest. In all cases, I’ll continue updating my progress on this post 
On a side note, after a big battle, it took me ages to manged to get my navmesh loaded with Yuka.js both on my client and server. Once it was loaded, it was acting weird, and after displaying as a mesh with baylon, I think I now understand why
EDIT:
Ok i’m giving up for today, nothing make any sense, i’m loading the same mesh on the server and client, but findPath(start, end) just does not seem to be working, anhd cannot figure out to debug it on the server side as there is no way to visualize what is loaded on the server…
github issue here too: How to correctly export a NavMesh from Blender 2.8 · Issue #9 · Mugen87/yuka · GitHub
Ideas?