Used for leisurely travel this airship isn't very large.
It is well-made, luxurious, versatile, and quick.

Size: 80 ft. long, 25 ft. diameter.
Speed:
10 mph (80 ft, 1 90% turn per round)
Crew: 10
Passengers: 20
Cargo: 1 ton.

Hull
AC:
13 HP: 300
The air in the hull keeps the airship airborne.
Damage - losing half HP the ship begins dropping at 60 ft per round, as gas escapes; Losing all the hull's HP and the ship plummets.

Helm
AC: 16 HP: 50
The helm allows the ship to perform 1 90-degree turn per round.
Losing the helm prevents the ship from turning.

Engine
AC: 18 HP: 100
The engine allows movement of 8 mph or 60 ft per round.
Losing the engine prevents the ship from moving forward.

Ballistas (up to 4)
AC: 15 HP: 50 each
Ranged Weapon Attack: (Int or Dex + PB if proficient) range 120/480 ft., Hit: 3d8 + Int or Dex Mod.