Well, if you insist on the acoustic nature of these instrumentals, I recommend you check out Drudkh. "Songs of Grief and Solitude" could be accuratelly described as ambient music played with folk instruments. Good stuff.
Also, if you're willing to go beyond a fetish for the guitar, there are a lot of released by metal bands (or musicians) who have released ambeint electronic works. Fenriz of Darkthrone has releases in this vein, as does Burzum, Beherit, Ildjarn-Nidhogg, Mortiis, etc....
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