Eidolon Question

[Relixander]

Is the following a valid Eidolon build for a level 5 half elf summoner (1.25 extra evolution points).

Biped form: legs, arms, claws (arms)

Evolutions:
1 - Improved Natural Armor
1 - Claws (legs)
1 - Improved Damage Claws (arms)
1 - Improved Damage Claws (legs)
1 - Magic Attacks
2 - Energy Attacks
2 - Ability Increase, Strength

4 attacks at +9 to hit (full attack action) dealing 1d6+5 slashing damage and 1d6 acid damage each

STAT BLOCK
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Male Biped (Claws)
CN Medium Outsider
Init +2; Senses Darkvision (60 feet); Perception +7
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DEFENSE
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AC 20, touch 12, flat-footed 18 (+2 Dex, +8 natural)
hp 28 (+8)
Fort +6, Ref +3, Will +4
Defensive Abilities Evasion
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OFFENSE
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Spd 30 ft.
Melee Claw x2 (Claws) +9 x2 (1d6+5/20/x2) and
Claw x2 (Claws) +9 x2 (1d6+5/20/x2) and
Unarmed Strike +9 (1d3+5/20/x2)
Special Attacks Energy Attacks (Acid)
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STATISTICS
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Str 20, Dex 14, Con 14, Int 7, Wis 10, Cha 11
Base Atk +4; CMB +9; CMD 21
Feats Friendly Switch, Power Attack -2/+4
Skills Bluff +7, Perception +7, Sense Motive +7, Stealth +9
Languages Common
SQ Magic Attacks (Ex)
Other Gear Backpack, Masterwork (empty)
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SPECIAL ABILITIES
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Darkvision (60 feet) You can see in the dark (black and white vision only).
Energy Attacks: Acid (Ex) Your natural attacks deal 1d6 additional energy damage.
Evasion (Ex) No damage on successful reflex save.
Friendly Switch Can move into allies space with no AoO and displace him into your old square.
Magic Attacks (Ex) Your natural attacks are magic.
Power Attack -2/+4 You can subtract from your attack roll to add to your damage.
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[Grick]

Relixander wrote:

1 - Improved Damage Claws (arms)

1 - Improved Damage Claws (legs)

Improved Damage (Ex): "One of the eidolon's natural attacks is particularly deadly. Select one natural attack form and increase the damage die type by one step."

I believe "Claws" is one natural attack form. It doesn't matter what limb the claws are on.

This is often debated, so check with your DM first to be sure.

Relixander wrote:

4 attacks at +9 to hit (full attack action) dealing 1d6+5 slashing damage and 1d6 acid damage each

Looks good. But then:

Relixander wrote:

OFFENSE

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Spd 30 ft.
Melee Claw x2 (Claws) +9 x2 (1d6+5/20/x2) and
Claw x2 (Claws) +9 x2 (1d6+5/20/x2) and
Unarmed Strike +9 (1d3+5/20/x2)

If he makes an unarmed strike, all of his natural attacks become secondary natural attacks, striking at BAB-5 and only gaining half strength bonus to damage.

This is assuming his unarmed strike is using a limb he's not using to claw (headbutt is valid).