Adjusted Crafting Rules

[Zhorn]

Some personal tweaks and adjustments to the baseline crafting rules in 5e.

To craft any item, a player much have access to and proficiency with an appropriate tool set (usually artisan tools) along with a recipe or schematics for the intended creation. Crafting magic items requires either the ability to cast magic similar to the intended effect of the item, or magical materials with an associated property (Dungeon Master's fiat). In the case of spell scrolls, a character must know the spell and have an available spell slot of the appropriate level accessible while crafting. A spellcaster can assist the crafter in making a magic item to supply the spell and/or spell slot requirements.

Plans, Recipes and Schematics
Plans and similar instructions are treated treasure of one level greater in rarity than the item they detail how to make. Normally found as treasure or bought from appropriate vendors, a player can also attempt to study and deconstruct an item in an attempt to replicate the design plans for it. Creating plans follows the same rules as constructing the same type of item it details, but at one level greater in rarity.

Base Items and Exotic materials
Crafting mundane items requires a material cost of half the associated sale price (see listed prices in published books). The cost for making items needn't come solely from gold pieces. If a player has access to treasures and exotic materials, or wants to use an existing item as a base component of what they intend to craft then they can (subject to Dungeon Master's approval) use the value of the item to offset the cost of the crafting. [Note: the value the materials supply to the crafting process might be different to the value the components could fetch on the open market, subject to Dungeon Master's fiat].
The materials supplied don't always need to become a physical part of the construction, and can instead be consumed in the same way material components are consumed by spells.
Based on what the players want to have their characters make, the Dungeon Master may deem that special or exotic components are mandatory for the craft (see Xanathar's Guide to Everything p129 for an example of CR ranges as ingredients).

Weapons, Armor and Wonderous items

Rarity	Required Proficiency	Material Cost
Mundane	+ 1	~
Common	+ 2	+ 50 gp
Uncommon	+ 3	+ 250 gp
Rare	+ 4	+ 2,500 gp
Very Rare	+ 5	+ 25,000 gp
Legendary	+ 6	+ 250,000 gp

All mundane items start with a base construction time of 5 days, adding an additional day for each tier of quality.
For each point of Bonus Proficiency, a character has, the crafting time is reduced by 1 day (regardless of modifiers, items will always take at least 1 day of work to complete).

Ammunition

Rarity	Required Proficiency	Material Cost
Mundane	+ 1	~
Common	+ 2	+ 5 gp
Uncommon	+ 3	+ 25 gp
Rare	+ 4	+ 250 gp
Very Rare	+ 5	+ 2,500 gp
Legendary	+ 6	+ 25,000 gp

A batch of mundane ammunition start with a base construction time of 1 day, adding an additional day for each tier of quality.
In a single batch of ammunition, a character is able to produce a quantity of ammunition equal to double their proficiency bonus plus a proficiency die (see Dungeon Master's Guide p263).

Potions, Poisons and Solutions

Rarity	Required Proficiency	Material Cost
Common	+ 2	10 gp
Uncommon	+ 3	50 gp
Rare	+ 4	500 gp
Very Rare	+ 5	5,000 gp
Legendary	+ 6	50,000 gp

Potion Crafting Limit
All potions and similar substances only take a day to craft each, and a skilled crafter is able to work on multiple concoctions at a time. In a single workday, a character can produce as many potions (or similar) as the value of their proficiency bonus.

Spell Scrolls
Preparing and binding magic into a spell scroll is more involved than copying a spell formula between books, and as such is more time consuming and costly

Spell Level	Attack Bonus	Save DC	Crafting Time (days)	Crafting Cost	Equivalent Rarity
Cantrip	+ 5	13	1	25 gp	Common
1st	+ 5	13	2	50 gp	Common
2nd	+ 5	13	3	100 gp	Uncommon
3rd	+ 7	15	4	250 gp	Uncommon
4th	+ 7	15	5	500 gp	Rare
5th	+ 9	17	6	1,000 gp	Rare
6th	+ 9	17	7	2,500 gp	Very Rare
7th	+ 10	18	8	5,000 gp	Very Rare
8th	+ 10	18	9	10,000 gp	Very Rare
9th	+ 11	19	10	25,000 gp	Legendary

Additional Costs
If a spell has material components with a cost value, those materials need to be supplied in addition to the crafting cost of the spell scroll. The material components are consumed in the crafting of the scroll.

[Zhorn]

While I originally posted this just to share a system I use, the progress of the thread
http://www.giantitp.com/forums/showt...rafting-system
has me thinking about ways I could improve this.
So while not originally intended as a PEACH, what are some aspects about these changes that could be improved, elaborated, or expanded on? My next turn at DMing will be in a month and I'm keen on making any improvements before then.