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I milled out the back for the speaker. The decoder JUST fits. You need to nestle it down over the drive shaft and fly wheel — in fact I have to reseat one of the A units just a bit. The shell is popping off. You can see I created a dummy board to protect the motor and give me a platform for my lighting connections, out of 0.02” styrene. All I need to do is trim the back a bit, to allow that decoder to settle down more. Mount with the flat side of the decoder facing upwards, and the “tall” components in the well above the shaft. Plenty of room, there.