Ethiopia to Morocco most definitely WILL NOT happen.. Google "sahara" to get you started on that one! And unless you like the idea of getting kidnapped by armed groups linked to Al-Qaida, familiarize yourself with the whole situation before you go. The threat is real.
Otherwise that new plan looks more realistic, though there are still some other smaller problems with it. Like only 1 possible border crossing for foreigners vehicles between Pakistan&India (east from Lahore).. and I can almost guarantee, that you will not get your foreign vehicle into Vietnam, unless you pay very big money to arrange it with a tour company (bit like China). Freighting across the Bay of Bengal usually happens from Kathmandu or Chennai, could be done from Delhi as well. Seems that Nepal is easier to send from, than India. Haven't heard of anyone doing it from eastern states of India. Bangladesh might be a possibility, too, but could be laborous to arrange I think.
Even though you might not be able to do everything you'd like to, that would still be one hell of a trip.