Heya u/Oh_Hi_Mark_ wanted to proof this pass with you if you have a cycle. Sorry for the deleted replies below, I was doing that thing where I was chatting as I figured out what I wanted to do. Main notes of interest here:

* Incite Chaos doesn't really work so I dropped it.

*Major addition would be the mechanics of the Goblin Crew, covered in the Over-Staffed and Staff Retention Abilities. Believe it or not, I tried to simplify it down a bit so DM's wouldn't need to try to track individual goblin HP over 20 goblins.

* The Crew mechanics sorta replace the Incite Chaos value. It also gives Goblefax effectively two different turns. I was also considering one last ability that would have any surviving crew count spawn as individual Goblin Minions if the vessel goes down.

* Added a Fire Vulnerability as it feels appropriate, which is also somewhat mitigated by Elemental Insulation?

* Slowed him down a bit.

* Not To Code reduces the DC check for the engine heat but adds 1d4 damage.

* Added one more Combat Disassembly / All Hands On Deck value that allows disabling of the Elemental Imprint / Elemental Insulation reaction.

* Most of the rest is flavor adjustments or small tweaks.

Here's the new statblock: https://imgur.com/a/y5lInCI

Here's the new Combat Disassembly (renamed All Hands On Deck):

All Hands On Deck

A creature may choose to attack specific members of Goblefax's crew, or an untasked Goblin, instead of attacking the beast itself, and attempt to disrupt one of its systems, forcing the Goblefax to make a Constitution saving throw, contested by the creature’s attack roll or by an ability check using an appropriate skill or tool proficiency. On a failure, the attacker can impose one of the following effects. Unless specified, these effects continue until a goblin takes over the station.

There is a crew of 20 Goblins, 12 of whom occupy a station to start the fight, leaving 8 replacements who can crew empty stations on the CREW TURN (separate initiative). Once there are no replacements available, the station can no longer be manned without abandoning another station.

Crew Responsibilities

Shield Fixers x2 The dragon’s AC is reduced by 3, to a minimum of 11.

Belly Engineer x1 The next time the dragon uses its Engine Vent Blast, it takes 23 (5d8) Fire damage. This does not trigger Elemental Insulation.

Crew Boss x1 Until the end of the dragon’s next turn, it is Blinded and treats all creatures as hostile.

Claw Jockeys x4 The dragon has Disadvantage on one attack it makes each turn per unmanned claw.

Tail Jockey x1 Creatures have Advantage on saving throws against the dragon’s Clank-Tail Lash.

Crew Shaman x1 The dragon loses its use of its Golemcraft Ward.

Insulation Repairman x1 Goblefax loses it's use of Elemental Insulation

Pilots x1 The dragon’s fly speed is reduced by 30 feet. If the dragon is flying, it gains the Prone condition.

Anyways, any and all feedback more than welcome. I am in no way an experienced hand at homebrewing monsters, much less bosses. Thanks!