Here is the trade I came up with
Clippers receive: Walker
Clippers trade: Kennard, Beverly
They get a rotation player for two non-playoff rotation players that can create some shots and take pressure off Leonard and George.
Blazers trade: Lillard
Blazers receive: Kennard, Beverly, Pritchard, Rob Williams, Langford, 21 1st, 22 swap, 23 1st, 24 swap, 25 1st
They get the full package of draft picks/swaps, an local college hero (Pritchard), one exciting young prospect (Rob), one solid young prospect (Langford), and a rotation guard that could be packaged for another deal or could just be a solid guard for a rebuild team.
Celtics trade: Walker, Pritchard, Rob Williams, Langford, 21 1st, 22 swap, 23 1st, 24 swap, 25 1st
Celtics receive: Lillard
This value is in line with the top end of what other teams have gotten for their stars. It leaves the Celtics with a rotation of Lillard-Smart-Brown-Tatum-Thompson with a bench of Grant Williams, Nesmith, Kornet (resigned).
I'd love to resign Fournier as well, but we are talking about 10-15 million over the luxury tax line, without any other players. I think this is a championship team, which makes it worth it.
I'd target Olynyk, Milsap, Reddick, Ariza, Matthews, Danny Green, Cody Zeller, etc for veteran role players.