Sure, it could work for some spot minutes (3-4 at a time). I'd be concerned about playing them all together because of fouls, though. If they're on the court, they're going to pick up fouls. I don't really want to see Shelden Williams in this series.
One other concern already mentioned was spacing. I believe rather strongly that we're going to NEED shooters to space the floor in this series. One alternative would be giving spot minutes to Scal at the 3, providing a bit more length, good boxing out, and a 3pt threat. I think he'd be okay defending Artest and/or Odom as well, at least in 3-4 minute stretches, and he also provides six fouls that would not go against KG, Sheed, or PP... I like to see what a Nate/PP/Scal/KG/Sheed lineup could accomplish for a strech in terms of generating momentum. I think that might be a good lineup on both sides of the ball, matchup wise and for short stretches, against LA.