After 2 weeks of learning Unreal Engine, FModel, Blender, and lots and lots of trial and error, I finally managed to make my first working Altermatic mod. So far I still haven't been able to create custom assets, and I am limited to using already existent Blender sources, but for now it's a start. The plan is to make as many variations of Pal models as possible to have the world visuals as diversified as I can.