Project Slots are not a thing. Tracking them is not fun, and Charms which do little except give you room to make more things are a silly and bothersome tax. Note that this is not a license to have ten thousand unique Artifacts all in the works simultaneously.
Any Charms which PURELY provide crafting slots, alter the cost of crafting slots, or enhance crafting slots in some way are removed/ignored. They are considered known for purposes of pre-reqs, but need not be purchased. Such Charms should be noted on each character type's respective page. If you encounter one you're not sure about, please bring it to the attention of staff.
Projects and XP Costs
When a Crafter is making something wholly mundane and routine, there is no cost in Crafting XP of any kind. The reason for this is simple: if one is a swordsmith, specialized in making military-grade weaponry, the majority of your time is going to be in making swords. It makes no sense that the swordsmith would be unable to just keep making swords. It is assumed that such an artisan is relying on proven previous designs and not trying anything fancy or special in such undertakings.
Similarly, although creating a multi-deck seaworthy craft the size of a house such as a Cog, Caravel or Galleon is considered to be an Artifact 2 Superior Project with no terminus (see Exalted 3e pg 243), it does not cost Gold XP. Same goes for large, complex but ultimately mundane structures.
There is an exception to this rule. If the artisan is attempting something above and beyond the norm, such as inventing a whole new type of weapon or creating a completely new and untested ship design, or perhaps creating a highly ornamental (but still battle-worthy) sword fit for a VIP, the relevant Craft XP must be paid to represent the inspiration and proven expertise needed to make it happen.