I third this.
I have just transferred over from using ModLoader.
I knew how to make custom block renders using the TileEntitySpecialRenderer in ModLoader, but I never learnt the other way using render IDs. Correct me if I am wrong, but from what I understand the TileEntitySpecialRenderer method is more for blocks with custom animations (like the enchantment table)?
Hopefully a tutorial is added to the Generic Mod showing both methods with the most recent Forge release (they have been the best tutorials I have seen so far). Or, at least someone gives us something on here to get us moving.
Thanks for anyone who helps us out with this (if anyone does, lol).