They also have some metal doors. But to be fair, I'm guessing more people are going to "ooh" and "aah" at the giant walking death-machine more than some bulkhead doors. But you never know, I guess.
From the announcement:
The Decimator is a brutal and hellish creation; the essence of a creature of the Warp bound and fettered within the armoured bulk of a bipedal war machine. Great slab-shoulders of tainted and defiled ceramite and adamantium, and a low-set ‘head’ give the Decimator a characteristic hunched posture which exudes brooding and vicious menace.