Golem creation questions

[DeathSpot]

Let's say I want to create an iron golem, but I'm only 13th level. I know every skill or spell needed except polymorph any object.
1. What's the DC? Is it:

A) DC 5 + 16 (caster level) + 5 (I'm not 16th level) + 5 (I can't cast polymorph any object but I have it on a scroll) = 31;
B) DC 5 + 16 (caster level) + 5 (I'm not 16th level) (I have a scroll of polymorph any object, and I passed the caster level check)
= 26;
C) I can't create one at all because the caster must be 16th level;
D) None of the above because I'm forgetting _______.

2. Tangentially to A), do I not need the scroll of polymorph any object if I'm increasing the DC by 5 to account for that? Or does the DC go up because I'd have to make a caster level check to use it, and I still need the scroll?

3. If I have someone else cast the polymorph any object, does the DC go up? What if they don't have the necessary feats?

Yeah, the second question overlaps the first, but you know what I mean.

[Malfus]

DeathSpot wrote:

Let's say I want to create an iron golem, but I'm only 13th level. I know every skill or spell needed except polymorph any object.

1. What's the DC? Is it:

A) DC 5 + 16 (caster level) + 5 (I'm not 16th level) + 5 (I can't cast polymorph any object but I have it on a scroll) = 31;
B) DC 5 + 16 (caster level) + 5 (I'm not 16th level) (I have a scroll of polymorph any object, and I passed the caster level check)
= 26;
C) I can't create one at all because the caster must be 16th level;
D) None of the above because I'm forgetting _______.

2. Tangentially to A), do I not need the scroll of polymorph any object if I'm increasing the DC by 5 to account for that? Or does the DC go up because I'd have to make a caster level check to use it, and I still need the scroll?

3. If I have someone else cast the polymorph any object, does the DC go up? What if they don't have the necessary feats?

Yeah, the second question overlaps the first, but you know what I mean.

1. C

From pfsrd:

Each missing requirement increases the Craft DC by 5. Regardless, the creator must meet all item creation feats and minimum caster level requirements.

2. You do not need the scroll if you increase the DC by 5 (though I do not know if having a scroll qualifies you as having the required spell, you may need an item that can cast 1/day)

3. If the second person has the spell you need, you do not need to increase the DC

From pfsrd:

These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item's creator (although access through another magic item or spellcaster is allowed)