CapnZapp
Legend
True.A feat is a REALLY steep cost in 5e. If you require a feat for crafting, I'd make only a single feat allow the crafting of ALL items.
How about:
Magic Item Creator Feat
You have the ability to create magic items. You routinely create consumables, but you also have the potential for a select few permanent items – your masterpieces.
* Each level, you gain a number of consumables equal to your level for free
* You may craft one permanent magic item per tier over the course of your career, plus one bonus item (at any tier) if you take this feat no later than level four.
Your level restricts the rarity of the items (consumables and permanent items) you create, as per the DMG. Permanent items (but not consumables) cost gold as per the DMG.
Note how each player is expected to add atmosphere him- or herself. This rule does not place any additional requirements whatsoever. In one campaign, it is okay if it takes a year and a day to create your Battlehammer, if it requires you to put a skill slot in Smithing, if you need to bathe the weapon in the blood of virgins or procure an Eye of Beholder as an ingredient. In another campaign, Tiamat will destroy the world the day after tomorrow, so here you are, no questions asked: you just say you create your Battlehammer and there it is for you to use.