How about a new section for SubAssemblies....within the next update we get a new option when we want to post a creation ( post as airplane / post as SubAssembly ) or by any other method like tapping on a subassembly in the game giving an option to post it as a subassembly
It will be very good for players to search and browse cool parts created by others and see the best of them....
For an example : maybe im building a tank but i feel there is something missing or i cant make like some funky trees parts so i go there and browse the section...i may find an APS then i use it... i may find a turret and gun stabilizer then i use it...
With a new auto credit system for this like ( a part used by "user name" )