I am using the station construction part of your mod and love how it fixes the one thing I hated so much about the colonization game: Gas giants being settled 'directly' in entirely abstracted floating colonies, instead of via bases like it's done for all of the pre-made core worlds. So first of all, thank you!
One thing I noticed during play yesterday was that I couldn't build a planetary shield on a siphoning station, because it 'cannot be built at a gas giant', and while I suppose this specific response from the game was simply due to the station automatically inheriting the gas giant attribute from its parent planet, I am also curious as to what your position on these shields is? Does their nature require widespread planetside installations, or could a single, very large starbase gain the same benefit a rocky planet would?
I have not tried building an astropolis around a regular world to see if the shield would be buildable in that case, because letting you know about this issue as soon as possible seemed more useful.