Preface, I don't want to do this, but if you're gonna do it go nuts...
... if KG is going then Pierce is gone. So,...
KG and Bass to LAL for Dwight. KG would work with Gasol and Kobe better than DW, and Bass can be moved again.
PP and a pick to ATL for Smith. Pierce gives them a star for Smith and after the season can be traded or waived for money savings. Add Melo to the pick if you must.
Smith and Howard are friends with Rondo, so both might re- sign. This year the C's are thin, but still are competitive. This year:
Bradley, Terry
Lee, Terry
Green,
Smith, Wilcox
Howard, Wilcox, Collins
...3 mins to back up g, sf, & pf/c
Next year...
Rondo, Bradley
Lee, Terry, Barbosa
Green, FA
Smith, Sully, Wilcox
Howard, Melo, Wilcox
...3 mins for depth