Wealth by level is a hard limit on what Mana-using(psi/magic/ki) or special material items you can use! (player convenience items such as a portable hole/bag of holding for a character with enough carrying capacity to not be encumbered by their gear do not count against your WBL, but only consider themselves (meaning you need to have at least 20,000 wbl to use a portable hole without issue))
Pattern Channels are a thing, they may take any form by default, and are enhanced at the same cost as a weapon. A pattern channel is basically a weapon for spells, any enhancements are applied to patterns woven through them, though any damage enhancements apply only to the first instance of damage from a pattern, and only one pattern channel may be used per pattern. Patterns must be delivered through them to receive the benefits, and they must remain within your aura(in contact, or very close, such as an ioun stone or psicrystal). Remember that the bonus on attacks from a pattern channel only applies to attack rolls made as part of spells, NOT to spell attacks.
Crafting uses dynamic item creation, though you may increase all DC's by 5 to be able to make a "blueprint" which allows you to produce that exact item without needing to roll for different challenges, or roll the skill checks again(though you still need to expend any resources you needed to make the checks the first time)
To determine the cost reduction of items you create, double the percentage value of any reduction, and add those all together as an "efficency" value, calculate the final cost as 100/(100+efficency) , this does not effect the WBL cost.
A crafter may make a permanent choice to be greedy or generous. A greedy crafter gains +10 WBL for permanent items per crafting feat up to a maximum of 50% (one item per slot, can change once per level). A generous crafter grants +5% WBL for permanent items per crafting feat to their adventuring party up to a maximum of 25% (one item per slot, can change once per level). These increases are more easily calculated by decreasing the cost of permenant items by an appropriate value to match the effect, so 20% decrease for a capped generous, or a 33% decrease for a capped greedy crafter.
Weapon Size/Die Progression