[Puke]

not at all, you just create a 'homeworld organic complex of great homworldly porportions' or something like that, that is on the same scale as the homeworld cultural center (and just as hard to reproduce) and every homeworld will start with one of them.

if thats not enough, then mod the AI design types so that homeworld class planets will call for two or three organic production facilities. that way, some of your homeworld is open space and senerey, and you are not just this giagantic industrial hiveworld.

see? works perfectly.