CK; resize object made of smaller multiple objects all at once?

[Mookeylama]

trying this mod...

https://www.nexusmods.com/skyrim/mods/33024

 

and it's awesome. but some added objects are waaaay too big for me. can see'em from across the map. i'd like to lower the scale of some, but many of the obects are made of many smaller parts. my fave is a waterfall cross thing at lake ilinalta but i'd like it about a 3rd of it's size. but it's made of like 70 parts.

 

any way to grab and rescale all of those at once w/ CK? thanks