Stephen McClain 955's page

Using a quantum power battery would solve the power issue and just have to manage the power used each round. Something like it worked for another game that had nuclear batteries that lasted a couple of hours so it was redone. lol showing my age.

It is just like making magic item and then you add the legendary.
So you make a +1 long sword as normal. When a magic item ascends to legendary status, it gains the suite of base legendary abilities and can have up to three additional legendary abilities.
Hope that clears things up.

Heavy Wagon Animated Object
Huge Land vehicle
This large, four-wheeled vehicle is primarily used in caravans to transport goods over long stretches of territory.

Animated Object (Huge) Wagon, Heavy
N Huge construct Squares 8 (10 ft. by 20 ft.; 5 feet high)
Init -2 Senses darkvision 60, low-light vision; Perception -5

DEFENSE
AC 17, touch 8, flat-footed 17 (-2 Dex, +11 natural, -2 size)
hp 78 (7d10+40 size)
Fort +2, Ref +0, Will -3
Defensive Abilities hardness 10 Immune Construct Traits

OFFENSE
Speed 30 ft., fly [clumsy] 40 ft.
Melee slam +15 (1d8+15)

STATISTICS
Str 30, Dex 6, Con -, Int -, Wis 1, Cha 1
Base Atk +7 CMB +19 CMD 27
SQ 4 construction points

SPECIAL ABILITIES
Construction Points
Huge animated objects have 4 construction points.

Additional Movement (Ex, 1 CP): Gains a new mode of movement (fly [clumsy]) at a speed equal to its base speed.

Faster (Ex, 1 CP): One of the object's movement modes increases by +10 ft.

Metal (Ex, 2 CP): The object is made of common metal. Its hardness increases to 10, and it gains a +2 increase to its natural armor bonus.

LOAD
Decks 1
Cargo Up to 4,000 lbs.

Spells and Cost

Shrink Item

DESCRIPTION
You are able to shrink one non-magical item (if it is within the size limit) to 1/16 of its normal size in each dimension (to about 1/4,000 the original volume and mass). This change effectively reduces the object's size by four categories. Objects changed by a shrink item spell can be returned to normal composition by a word of command from the original caster.

Shrink item can be made permanent with a permanency spell, in which case the affected object can be shrunk and expanded an indefinite number of times, but only by the original caster.

Permanency Shrink item 11th 7,500 gp

Animate Objects

Permanency Animate objects 14th 15,000 gp

MW Heavy Iron Wagon 500 gp

Cost 23,000 gp 4,600 each

In our game made it simple replace + 2(3)x Tier with just DC + tier. It makes it harder as you go up in level of ship and takes care of the multiply problem with the DCs going up way too high at higher levels.

All of the post I have read here is why we removed this item from our game.

Remember this Cursed item
Girdle of Femininity/Masculinity: This broad leather band appears to be a normal belt, but, if buckled on, it will immediately change the sex of its wearer to the opposite gender. It then loses all power. There is no sure way to restore the character's original sex, although there is a 50% chance a wish might do so, and a powerful being can alter the situation. In other words, it takes a godlike creature to set matters aright with certainty. Ten percent of these girdles actually remove all sex from the wearer.