Working with 3d Armor is probably the most frustrating thing I have ever done with Minetest. It may look fine on the outside but it runs primarily on legacy code found only in minetest_game. Supporting 0.4.x is a priority even in the latest release at a detriment to 5.x support. It is just a experimental mod taken way to far with minetest due to its use in many mainstream servers. A rewrite removing the unnecessary legacy support and to implement entity based graphics instead of exclusively texture mapping is needed.