The thread isn't dead there just isn't much to talk about it is a extremely tiny mod that is pretty much complete. There is very little to add.
On the subject I am about to update the main post with a new version that changes the recipe. The 3D Furnace will be crafted with smooth stone instead of cobblestone so that it doesn't break the achievement progress. It also removes the crafting recipes that let you swap between the furnaces. Instead you can cook a vanilla furnace into a 3D one or just make one with smooth stone.