XXXG-01H2 Gundam Heavyarms Kai
XXXG-01H2 Gundam Heavyarms Kai
Gundam Heavyarms Kai

Model Number: XXXG-00H2
Head Height: 16.7 m
Base Weight: 8.2 t
Armor Materials: Gundanium Alloy

Equipment:
self-destruct system

Mounted Weapons:
2 x vulcan, fire-linked, mounted in head
2 x machine cannon, fire-linked, mounted on torso
2 x chest gatling, fire-linked, mounted in torso
2 x 3-tube homing missile pod, mounted in shoulders
2 x 12-tube micro missile pod, mounted in leg pods
1 x army knife, mounted on right forearm

Carried Weapons:
-gatling shield, mounts 2 x beam gatling, fire-linked, mounts over left arm

Ability Levels?:
Fighting 110
Weapons 170
Speed 130
Power 150 (140?)
Armor 140 (150?)

Total 700
Explanations:
I would think that the Heavyarms Kai's second beam gatling cannon would add at least 10 points to weapons.  The 10 points to power would be necessary to lift the additional weight caused by the added barrel and ammunition with one arm (the large weight difference between the Heavyarms and Heavyarms Kai can be easily seen).  The conversion to space combat would add 20 points to speed due to the extra thrusters necessary for battle in space.  While it is possible that the 10 points to power could be allocated to armor instead, it is not consistent with the type of role the Heavyarms performs in.  But again, this is all speculation.
Tactical Discussion on the Gundam Heavyarms Kai
After original Heavyarms was recovered, it was refitted for combat in space, and also upgraded to be on par with the new Deathscythe Hell and Altron.  Even more firepower than the original, The Heavyarms Kai has the highest weapons ability in Gundam Wing.  The speed is improved with the added thrusters needed for space combat, and the Heavyarms power is also increased, to deal with the extra weight from the dual beam gatling cannon, and to slice through the heavier armor of the Mobile Dolls with the army knife.

Weapon Analysis:

2x vulcan - still mounted in the head, the use for these weapons has not changed.

2x machine cannons - perhaps ineffective against the Mobile Doll Gundanium armor, these cannons must be used against weak areas and possibly fired just for general annoyance.
chest gatlings
2x chest gatling - useful against the heavier armor of Mobile Dolls, it would take significantly more time to penetrate however.

1x dual beam gatling - twice the firepower of the standard beam gatling, this weapon can still obliterate enemy units, now only in half the time.

6x homing missiles - stored 3 each in the shoulder pods, the employment of these missiles has not changed.
micro missile pod
24x micro missiles - 12 in each leg pod, these missiles would need to be concentrated more when dealing with Mobile Dolls.
army knife
1x army knife - when out of ammunition, the Heavyarms must move to close combat and use this knife.  With the Heavyarms Kai's increased power ability, even Mobile Doll Gundanium armor can be severed with relative ease.