Not exactly sure how it's written in five, but it looks like a copy paste of 4. The rating of the colony is how many systems it can sustain. In 4th they dn't generate nanites they just keep them sustained. You had to buy your systems seperate, the colony was just there to keep them from degrading.
Being able to switch say, O-Cells over to a Lymbic Stimulator doesnt really makes sense, just sounds like cheese to me.