The resource names for the classes can be found by looking at the spawn commands for items on the web page "http://ark.gamepedia.com/Item_IDs" and taking the last part of the string from the last PrimalItem text up to the apostrophe and adding "_C" to the end. For example Fiber has the entry
"Blueprint'/Game/PrimalEarth/CoreBlueprints/Resources/PrimalItemResource_Fibers.PrimalItemResource_Fibers'" which gives a class name of PrimalItemResource_Fibers_C .

It should be possible to use any item as a requirement for crafting including PrimalItems from other mods as long as you are able to determine the PrimalItem's class name.

Further documentation on server configuration can be found at the following web page:
Server Configuration[ark.gamepedia.com]