I am seriously interested in golem creation, but I've got a lot of questions about this topic.
1. Most golems require both divine and arcane spells. For instance Clockwork Golem (Bestiary 2, p. 137) requires Animate Objects (bard/cleric 6) and Telekinesis (sorcerer/wizard 5). How such golems are supposed to be created? Do they require the cooperative efforts of several characters, or are there some other ways to create such golems?
2. If the golem is created by the two chars with Cooperative Crafting, do they both need to qualify the required caster level or one is enough? Logically, one should be enough, especially if the golem is supposed to be created by a single person somehow: the level should be needed for "activating" the golem.
3. Some golems have strange requirements. For instance, Flesh Golem (Bestiary 1, p.160) has CR7 and requires caster level 8th, but it also requires Limited Wish (sor/wiz 7), which itself requires 11th level minimum. Was there any errata on this?
4. Can the Arcane Builder discovery (Ultimate Magic, p. 86) be applied to golem creation? The text says about "magical items", but aren't golems the magical items too? :)