Dimitry,

Interesting project ... "From Father to Son: The Buddha's Training of
Raahula." If you can get together a minimum of 5,000 words, the Buddhist
Publication Society might consider publishing it (if it hasn't already been
done). Query Bhikkhu Bodhi, Editor, Buddhist Publication Society, 54
Sangharaja Mawatha, P.O. Box 61, Kady, SRI LANKA.

As for Channa ... Bhikkhu Bodhi writes in his note 181 on Channa, AN 22.90:

QUOTE

Atha ko carahi me attaa ["but then who is my Self?" the question that
occurred to Channa]

Spk [Saaratthappakaasinii, Sa.myutta Nikaaya-a.t.thakathaa]: It is said that
this elder had started to practice insight meditation without having done
discernment of conditions. His weak insight could not eliminate the grip of
self (attagaaha), and thus when formations appeared to him as empty,
agitation arose in him along with the annihilationist view, "I will be
annihilated, I will be destroyed." He saw himself falling into an abyss.

...

Discernment of conditions (paccaya-pariggaha) is a stage in the development
of insight in which the meditator explores the conditions of the five
aggregates (see Vism., chap. 19). In the proper sequence of development this
stage should precede investigation of the aggregates as impermanent,
suffering, and nonself.

END QUOTE

You can probably find the relevant passage from the commentary -- in Pali,
of course! -- if you visit http://www.tipitaka.org


Derek.