Following the main road outside of the stone maze (the big asphalt one to the east) from south to north, you'll find the world just straight up ends (unfinished map area as of now, might be a load zone in the future.) but backtrack to the last available left you can take and follow it taking the next right and you'll find yourself at the craftsman hidden behind a fence with a truck in front of it.

Honestly i just find it by vibe, but BE CAREFUL both entering and exiting the craftsman as there is a spawn point for enemies not even like 15 feet away from his fence to the right if exiting the craftsman's shop, ive seen so many wild things spawn in that empty corner from every single faction, to hordes of freaky crawly guys.

organised like : GUN/ARTIFACT/NUMBER OF COINS = product (what it do summed up)
the text follows the same order as the pictures (from top to bottom starting with the shortgun at the top and ending with the smg).
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TYPE 04 Shotgun / caustic wardstone / 2 coins = Basilisk (acid shotgun w charge up)

Scoped PKT-52 scout rifle / Crucible / 3 coins = dyrnwyn (explosive shots)

BR-61 battle rifle / purple tesseract / 6 coins = ma'ii musket (fires random projectiles )

45 HMP/Blue tesseract/ 2 coins = flail of osiris (bullets that hit targets return to mag )

RIKTOR 45 magnum / arc wardstone / 2 coins = mjolnir (chain lightning shots )

Model 1931/corvo sukll / 3 coins = holdas needle (homing shots)

Type 93 Rifle/singularity bomb / 2 coins = vortex rifle (black hole shots pull stuff in)

M-TR14 Carbine/Anti-toxin Pollyp/ 2 coins = fumigator (toxic cloud air burst)

Type 15 SMG/amber manifold / 4 coins= turbo coil (++fire rate and muzzle velocity)

RED ROOT SAMPLE
Phosphates
Glowing lab sample
Lightning Rod
Lodestone.

the rest are trades that COST red coins and the only good ones are for the high end cultist gear and maybe the gold tesseracts if ur in to fast travel.

basically i just wanted this here so when im not AT THE CRAFTSMAN i can double check what i need when looting out in the world, and also figured id make it a guide so anyone else can use it too.
i dont know if his shop changes at all cause i could of sworn i had him build me some of the lamer weapons the cultists already drop and i dont see them as options anymore (maybe im imagining things).
either way enjoy <3