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Okay, so you want something bigger and held up with magic rocks. That's fine, but I think the point was that the standard airship is only 50k, and has a magical engine that isn't some rare hard to find artifact.
So add in the cost of extra materials to make it bigger, and figure something out for the magic rocks. Unfortunately, fly isn't one of the spells that can be made permanent.
Also, don't forget this:
https://www.d20pfsrd.com/equipment/vehicles/air-vehicles/alchemical-dragon
This alternate rule set on buildings are also useful:
https://www.d20pfsrd.com/gamemastering/other-rules/kingdom-building/settlem ents/buildings/building-augmentations-fortifications/
However, this is definitely a matter of homebrew, but even as a more lenient DM, I would never allow a wizard to build something like this without Craft Wonderous Item.
You probably want to make the ship out of dragon hide, at least partially. Elemental immunity to fire will probably come in handy, especially depending on the method of propulsion.
Also, you can cast Permanency on a "Gust Of Wind" spell. I believe you can target an object, not just an area. You could have something resembling the Helicarrier from Marvel.
Animate Objects is also an option, although you'd have to permanency the spell on different components of the ship before putting it together, since the caster level needed to animate a colossal object is 32.
One of the ways to give the ability for a large object to float is via Carpets of Flying. You'd need lots of them, of course.
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Also, don't forget this:
https://www.d20pfsrd.com/equipment/vehicles/air-vehicles/alchemical-dragon
This alternate rule set on buildings are also useful:
https://www.d20pfsrd.com/gamemastering/other-rules/kingdom-building/settlem ents/buildings/building-augmentations-fortifications/
Fixing your link on the Alchemical Dragon
Building augmentations are 3rd party, so no helping that one.
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If you go by the magic item creation cost rules to make a cost for your flying rocks, then each one with a continuous fly spell effect would be 30k.
Spell level * caster level * 2000gp
Animate Objects is also an option, although you'd have to permanency the spell on different components of the ship before putting it together, since the caster level needed to animate a colossal object is 32.
There are two ways around that 32nd level casting:
1) Witch coven. The death star coven gets up over 100,000 levels for casting, if I remember correctly.2) Don't create it by casting the spell but by using the construct crafting rules.
/cevah
Back in 2dEd AD&D days, my own end-around for a ship with the ability to fly was a sufficiently powerful air elemental bound into the vessel.
Not sure if that translates to PF, which tends to reference very specific spells for their magic items.
Instead of permanency with animate objects, you can use Craft Construct feat and animate objects. Caster Level is not a prerequisite for crafting except for specified cases like armor, shield, weapon to hit,ect. (The +1 limit per 3 caster levels... or per 2 in case of bracers of armor)
What can this airship do?
What is its purpose/role in the campaign?
What stories/adventures will having it change?
How much effort will be needed to maintain/protect it?
Answer these questions and then you can start to figure out the price, beyond that of a ship. If it is only ever going to be used for behind the scenes transport then the only reason to make it more expensive is if it will remove all of the travel stories you want to tell. Conversely if it will open up a whole new series of stories that you want to tell then there is no need to make it expensive since you kind of want them to have it.
On the matter of expense, you can front load the expense or back load it. Front loading is the obvious one; it costs X gp to buy. Backl loading is a bit more complicated. The ship costs X gp every month for salary and basic maintenance. Repairs cost extra. Additions/modifications cost extra. And then there is the factor of how often you are going to target the airship. I am not talking about if they bring it into combat deliberately, but how often are people going to try to steal or sabotage the airship? How often are you going to force the airship into combat?
If you are going to make it expensive to own in the long run, there is no reason to put extra expenses on the front end.
Animate Objects is also an option, although you'd have to permanency the spell on different components of the ship before putting it together, since the caster level needed to animate a colossal object is 32.There are two ways around that 32nd level casting:
1) Witch coven. The death star coven gets up over 100,000 levels for casting, if I remember correctly.
2) Don't create it by casting the spell but by using the construct crafting rules./cevah
for 2, to animate object with the construct crafting rules you are also limited to HD =< CL
Magic-users can create permanent animated objects in one of two ways, either by using the animate objects spell in conjunction with permanency, or by making use of the Craft Construct feat. Using the Craft Construct feat requires the creator to construct or purchase the object he wishes to animate. He must then spend an amount of gold on reagents—to determine the amount, add the animated object’s HD to its CP, and multiple the total by 1,000. The creator must be of a caster level equal to or higher than the animated object’s Hit Dice.By the way, rules for constructs are kind of a mess in PF1, they are in a large amount of different published books and while they don't directly contradict one another, the later books usually add a new layer of complexity or restrictions on top of previous ones.
Your requirement of CL >= HD is specific to the AP. It also has an alternative way to calculate construct cost. If you want to use that alternative, fine, but that limit is not in the Core book or in Ultimate Magic. where the rest of the construct rules are.
/cevah