I managed to make it all work just before I saw your message, but you explained a few things better than I had
I had read in the manual that textures links Inside the .egg were automatically taken care of when making a .p3d. I still copied that maps folder to be safe, and it worked. panda3d.org/manual/index.php/Using_packp3d
At first I thought it has something to do with the ModelPath (interesting stuff on prc model directories, looks like you helpa lot here) . I’m still not quite sure what had happened, but satisfied enough to sleep. Finally.
so -r moves copies the default models to the “root” of the p3d file ?
Anyway, thanks a lot for your answers, in other threads too ;D