Dismanteling the cannons has no effect. Althought the entities are not present anymore the GUI still shows the charges and the cannons can still be fired.
P.S. I now have dozens of cannons by dismanteling and rebuilding them. I mean, it's a cheat after all but that is too much ;)
EDIT: after relocating the Space Platform the charges are still there! This means the cannons can still be fired even though there is not platfrom in space at all.....

Dismanteling the cannons has no effect.

There is no dismanteling for ion-cannons! It is also not written anywhere that there is such a thing.
you can only dismanteling the controller which is needed to install the ion-cannon.

I see but then it's even weirder, because I don't need to build the Ion Cannon, since right after placing the Orbital Ion Starter Pack Mk2 the charge starts to count down and the UI tells me "Ion Cannon #1" "Ready to fire and so on for every Starter Pack that's placed. Even after the Space Platform moved on to another planet the charges are still available. It is really messed up somehow...
EDIT1: I understand now! The Starter Pack Disappears, the Cannon stays. I just had too many and I didn't realize that these are consumed while being placed and deleted.
EDIT2: Sending a Starter Pack manually into orbit makes it disappear. It is not going to orbit - it just vanishes. Please remove that option. Thx!

I don't understand what you're talking about. can you please simplify your request so that people can understand what you want to say?

e.g.:

I don't need to build the Ion Cannon

you have to craft and to place the starter pack

Sending a Starter Pack manually into orbit

manually by magic? ;-)
Orbital Ion Starter Pack can be send by the rocket
Orbital Ion Starter Pack Mk2 can not be send by the rocket (to havy)

...

you have to craft and to place the starter pack

yes, obviously. No questions about that.

manually by magic? ;-)
Orbital Ion Starter Pack can be send by the rocket

No, by putting the starter pack for Mk1 into a rocket by hand. There are two options then:
a) send it to a plattform or
b) send it to orbit
Sending it to orbit makes the starter pack vanish into oblivion. I don't think that is intended but I don't care. Now I know that it has to be sent to a platform ;)

Orbital Ion Starter Pack Mk2 can not be send by the rocket (to havy)

Yes, Mk2 needs to be build on a plattform. No question about that.

Topic closed as far as I am concerned. Thank you for the mod - bye bye damn demolishers ;)

OK, so either Send to Obit was added later or I've overlooked it all this time. Because if it had been there from the beginning, I wouldn't have had to add the platform stuff. ;-)