Ancient gun chassis in Vendigroth- how many?

I've forgotten- how many ancient gun chassis are meant to be found in the Vendigroth ruins? I seem to remember there were two, but I've just ran through the dungeon and only found one... What am I missing?

If there meant to be two- where are they supposed to be found? Which levels?

 

I only found 1 before I finished the game a few days ago. Uneven amount of supplies for all those schematics, hmmm? ^__^

 

I've found the second one, finally. Remembered that small room on the first level.

 

Remember that you can also get one on the Isle of Despair.