Just to note: with 9.6-9.7, this version of flipping between Unity cores, this process has become very buggy. I did the above the other day while setting up a BA on a newly 'acquired' planet (don't mind the Zirax corpses, they'll biodegrade eventually), and a re-occurring Exception error has now made this gamesave unloadable. You might want to wait until the next major release to try this, and/or make sure you manually save your game before doing so. I did not, and a long-running gamesave is now garbage. On my SP games, I tend to try to do things as 'legit' as possible, so for the above, it's a time consuming process. I have the factory spit out the 3-8 modules I want for a particular base, position them near each other, then changemode/exit/load to creative to reposition and mergestruct them in one session, then changemode/exit/load back to survival. As opposed to doing it every hour after a new unit has been completed by the BP factory. Just relaying some tips on the process which I have used for quite some time. SAVE before you start the changemode process. But a friendly hint to Devs: let us use mergestructs in Survival, please.