[Baron Munchausen]

I can't guess on the tech not showing up, though I would ask if you have started a new game for this? Changing the tech file in a game will produce all sorts of screwups. You must start a new game. And the tech file is just as sensitive to extra blank lines as the components file.

Getting the AI to use the right cargo components is in the *_AI_designcreation file. You need the 'must have ability' set to cargo storage and that's how the default files are setup. It should choose the 'best' cargo component (the one with the highest number) if it's setup like this. Have you modded the designs?