Did Ven. Ñānavīra ever write any detailed meditation instructions? I only remember seeing one letter regarding meditation from him, and in it he gave pretty standard Satipaṭṭāna instructions.
"Delighting in existence, O monks, are gods and men; they are attached to existence, they revel in existence. When the Dhamma for the cessation of existence is being preached to them, their minds do not leap towards it, do not get pleased with it, do not get settled in it, do not find confidence in it. That is how, monks, some lag behind."
- It. p 43