1-150K Nxt for explaining how its POS works.
2-100K Nxt for explaining the coloredcoin feature and its decentralized implementation in Nxt platform (as BCNext promised it to be this way)
3-50K Nxt for explaining messaging, instant transaction option, decentralized DNS...
If you can't do all the 3 parts, but still can collaborate with Nxt devs to hear from them and finally shape and write part 2 or 3 as well, we can pay 50K Nxt extra in addition to that 300K Nxt mentioned above.
And this is all for the technical whitepaper. About general articles mentioned in OP, those bounties above are still available for anyone to grab!