@Mod.EventBusSubscriber(value=Dist.CLIENT,modid= CottageCraft.MOD_ID)
You are registering your event handler to the wrong bus, so your registerEntityRenderers() is never executed. Remember that when no bus is specified, default goes to the forge bus. ModelRegistryEvent is fired on the mod bus
There is not need to extend ItemModelsProperties since func_239418_a_ is a static method. You have to register your properties during your client setup event