It would seem to me that if stabilizer distance was no longer a thing, if power was simply a matter of power blocks and corresponding stabilizers to keep the power blocks from cooking off in battle, that there would be little reason to maintain the prohibition versus docked power. Self powered turrets could again be a thing.
This would make ship building MUCH easier for the more casual builders, as they would then be able to simply download a self powered turret from community content and add it to their ship. Without self powered turrets, A player has to be MUCH more judicious.
The big problem with docked power was not so much free floating turrets, but rather docked internal reactors free floating from battle damage, clipping inside the ship, and the lag that caused. (This could have been solved by making destroyed docked systems inert instead of free floating, which should still be done.) The prime motivation for docked power however was to exceed power caps. It was the power caps ultimately that were the true culprit.
It would seem to me that the current system being developed has done away with power caps, attempting to limit power solely by forcing giganticism. This again is not IMO a good way of handling things. The game has problems with giganticism, you should not create mechanics that reward it.
Do away with power limits entirely. Make power a linear function of how many power blocks you have on a ship. Give each separate entity a 'quickly' (like with a mere 100 blocks) achieved bonus of power equal to perhaps a thousand blocks and then level it off at what the current power per block is. This will be sufficient to make effective small ships and drones, but it will not be so large as to encourage battleships with eighty internal docked reactors (those kinds of ships are quite complicated to build, and most won't bother just to save 8000 mass).
Yes, you will get ships that have lots of power relative to what they would have otherwise had with your linear giganticism model. So what? Balance for that. Reduce weapon power, increase shield effectiveness, lower armor mass, etc.. There are all sorts of ways you can balance for ships being able to build in the amount of power they want. You will take away un-intuitive build restrictions that inevitably result in absurd distortions as people try to build around the restriction. Let people simply build as they see fit.
To encourage open space for RP building, hurry up the crew and quarters system. If that will take too long, create a placeholder massless, empty space block that gives say (as a possible example) two extra chamber points 'if' 50% of the blocks of the ship are those massless empty space blocks. Bingo, lots of RP space, even in ships that are not built for RP.