The final flight of the USS constitution was an amazing quest but making ironsides, the navigator ECT recruitable would be hilarious

He's not a companion so I doubt it. It looks like you can mod only companion robots or build new ones from the scratch.

'Whilst it would be an honour and privilege to join you on shore leave, Lieutenant.

regrettably I find I am restricted from doing so, on account of my inability to fit in the elevator...'

this is why I am not building a sentry. Too much junk in that trunk.

But but, imagine the sentry bot body on spider legs! That'd be cool <.<

Cool, yes. However, now try traveling with it. Sure out in the open, it'll be fine, but as soon as you go into a place and you meet it's nemesis, the narrow door.