I’ve recently come across a book called “Bonpo Dzogchen Teachings” by
Lopon Tenzin Namdak , having only just started it I don’t know how useful it’s likely to be, but it’s been very interesting reading so far. So far, it’s got a lot of interesting stuff on Bon and Buddhism, and it seems like a very practical collection of material overall with emphasis on the Bon and Dzogchen models. There’s an interesting section on “The Attaining of Buddhahood “ in Hinyana, Mahayana, Sutra, Tantra and Dzogchen which is well worth a read.
If anyone wants a copy, drop me a PM with your email and I’ll send you it, it’s a 12MB PDF; no idea about copyright or anything, I downloaded it through a torrent so I’ll spread it in the spirit of the Dharma.
I’ll post a separate thread about a rather interesting line I’ve just come across...