Had to do a bit of scratch building for another model, so did some work on this at the same time. The Amusing Hobby kit has later model stowage bins provided. I am assuming they researched the ex-Littlefield, now at Bovington one. That was refurbished and the bins are not correct for a mark 1.
The issue is the corner is cut off on later versions, but the mark 1’s are perfect rectangles. Not a big issue to fix, just a matter off cutting into the bend on the side piece so you can straighten it, trim off the slightly longer end that results, then fill the gap. Of course I realised this after I had used a complete new piece of styrene to replace the kit part first time around!
I chose to remove the whole rib on the lid, rather than graft a piece at the end.
Just a bit of sanding to do on the lid edge.
Found a video clip that shows them quite well, although the turret on this one seems to have some unusual features. This is a declassified training film showing the very first batch. There is a lot of talk about the turret not being right in areas, yet comparing the original pics I posted to the video, and then looking at other pics, seems to show some differences from vehicle to vehicle.