I just tried to make a server with this mod to get a skyblock world, following the instructions.
Everything works, appart one important thing : i can /tp to the structures (like the wich hut for example), and their mechanics work, but there I don't see them with MiniHUD mod...
Any idea ?

Thanks

According to minihud, structure bounding boxes only work in single player, without a server-side mod. You also need the Servux mod.