a lot of good ideas, and definately the right direction
the supporting/feeding bottom planets from trading/exchanging resources could be easily implemented and makes much sense to me, as atm those ressources are lost in space (a concept which will never occur in nature)
just remove c200 planets from the list of bottom planets so the ressources feed the system
maybe also for deleteing planets, transfer em into ressources for that pool aswell. some weird hardly understandable formula will do here, i know PA Team likes those