Almost any add-ons can be stacked if done carefully. Either set the tables first, raise gozas, set forge and lower to under tables, or set forge first and lower chopped tables onto it. I -think- either way would work, but I've only tried the first way with a small forge. If they are completely covered by the tables they may not work - my small forge had to be showing above the table to be usable, although it still looked pretty cool.but over a a large and small forge? mm time to read some stuff