The die measures 2.8mm x 2.5mm. I have higher-res pics, and I'm going to clean it again in nitric acid before using Whink on it.
I'm surprised how much plastic is still stuck to the die; the plastic basically fell apart after I torched it, much more easily than even the TI chips. Then I cleaned the die in 300C nitric acid for 6 minutes, followed by ultrasonic cleaning in MEK. I repeated the cleaning twice more.