So looking it over I saw that the right turret side was hanging down below the bottom of the forward turret floor. Also, something just didnt look right.
Neither turret side follows the floor accurately. On the left side their is a gap between the side and the floor when the front and back is secured to the end plates. On the right side the floor interferes with the side being able to pull up tight to the end plates.
After full disassembly I bolted the two sides together, outside surface to outside surface. I did this at the front using the four holes at the front of the side, and the two slotted holes part way back. the top and front edges all lined up nicely, but the bottom of the right side was 8MM lower than the left side.

I scribed a line in the right side where it needed to come off. The I unbolted the two halfs and rebolted them using the holes in the back. Same problem but only about 4MM to low this time. Again scribd a line in the right side.

I measured the angle of the cut and set the saber saw to that angle. I bought some pricey Swiss made blades and started in on the side. The thickness of that part made the work incredibly slow going (hours). Then some slow work with the green flapper wheel and files got it to were things were nice and straight.
Then back to why one side doesn't touch the base and the other side interferes with the base. After a bunch of measuring I concluded that the base (floor) is symmetrical. While hard to tell I finally figured a way to measure the bends in the sides. Conclusion, the left side is bent too much and the right side is bent too little and not in the right place.
I had to resort to blocks and jumping on the side is an effort to lessen the bend in one and tighten in the other. But they are thick and short so it took a lot to do very little. Things got closer. Close enough that by selectively tightening the mounting hardware around the bottom of the sides I could get a good fit at the front and the back plates. It was confirmed (at least to me) that it was good enough because the roof sections all bolted together dropped right into place. Yay.
There were other problems with this but more easily managed. The notches in the lower area of the sides is in two different places, not symmetrical. The floor doesn't match this discrepancy so there is fiddly, sawing and filing to get it together.
In my kit the major problem seem to be the right side of the turret. Maybe it is just mine, but look there first if you run into difficulties.
I took pictures, and will update the turrest sections once I get the pics sized and hosted.