You can check the FOCS files and their change history.
We need to focus. If it's going to be on a "bonus theme that is unlocked late game and that has OP stuff", to do what you suggest we shall drop the bonus theme idea (only because some player don't like drawbacks?):One Idea for Enclave of the Void, from way back, was to have it earlier in the tech tree and work more like the Industrial Center. So the bonus starts small but you can upgrade it.
I think "OP stuff" goes well with the Void theme. The most destructive weapons, the most powerful stealth parts, the strongest shield, etc. And also the drawbacks stuff: you are dealing with dark and terrible forces.
But the whole idea of the themes and the reworked weapons system is motivated (for me) firstly to avoid the current boredome of "there is most powerful shield, weapon, hull, engine... and so everybody does the same late game". If you make something OP and don't give it a drawback to compensate, then the whole plan flushes down the toilet.
There isn't enough meat in there. Too similar to energy hulls.Small and really fast. The opposite of the massive hulls, that Mech gets.
I don't know if we should separate habitability boosts by metabolism.I was also thinking that the habitability boosts for self-sustaining metabolism could go here.
It synergises well with the organic hulls and weapons, plus it's just one single tech.Maybe the monster domestication could go into psionics?
Can you think of a psionic theme with around 36 techs not including refinements using the influence projects and policies already sketched out plus any techy stuff you like to be on the theme?