Where do lava temples spawn? What blocks are they built with? How much health do the new mobs have? How much damage do they deal?
No support unless you explain the points above. And I don't think copying te ocean monument to the Nether is a creative way to implement the sponge.
Obviously Lava Temples spawn in Lava Oceans in the Nether. I already said they use the same materials as Nether Fortresses (Nether Brick). Because they are the Nether version of Overworld mobs they will have the same health as them. Also I forgot to mention that Fire Guardians shoot fire balls like ghasts.