I have just found a good reason not to glue that upper grouser box.
I have modified my turret to correct the shape & probably took too much out of it.
A quick fit shows a major conflict between grouser box & boom
Looks like I'll have to sand down grouser box (take "legs" off bottom) and put a spacer ring atop the hull to boost the turret up.
Hopefully that takes care of things ....
John