Usually don't agree with your whacky theories! But.... David somehow trying to make himself more human would slightly fit with the themes of the movies. I could actually see that being a possibility and kind of freaky at the same time. The whole Pinocchio becoming a real boy theme.
There's a chance though we are over thinking this and Awakening will be an Alien chasing 6 people around a ship.
There's stuff in David writings about the Engineers about it:
"While the Engineers have definitely taken steps to evolve their genetic structure and durability they curiously maintain a strange deference to the sanctity of their original pre-technological state."
Perhaps he unknowingly infects himself during the upgrade process. With the black goo being unpredictable.
Awakening on a ship would be to plain. I think at least we'll get an Aliens type movie with Engineers inserted.
Or a sweet full blown spectacle conclusion of sorts. That's more of wish than a guess.
Btw, whacky theories? Me?
When my "leech" feels something warm and moist, it moves in its direction also .........
[sorry for the beavis/butthead humor, I couldn't resist)
Uuuh... Huh huh, huh huh.