Note that, according to some of the (golem/homunculus) creation rules there also seems to be 'metalworking'.
I have become completely frustrated with the crafting rules.
In my opinion, they have been created to support NPC craftsmen, who have either the skill and/or the time to spend years to create one set of masterwork armour.
For PC's, they are completely unworkable. Both because there is no telling which craft skills you should take, and because normal adventurers don't have the time to create stuff on their own.
Talk to your DM or, if you are the DM, take craft skills that are generic enough to be applicable (as mentioned, taking 'blacksmithing' to include armour and weapon smithing) and try to get your hands on 'fabricate' to reduce the crafting time to virtually zero.
It's the only way to be able to use the crafting skills without getting frustrated.
Oh, one last thing: if you use the above to break the game's economy, you're not getting it.