Here are a couple of pics of the first trial fit of the top and bottom of the interior, a few structural tweaks were needed to the base before it would support the top half, this was done and it still needs a bit of tweaking to get the edges and angle right, it also just about fits inside the sphere, but may need a little trimming here and there yet, as well as windows and doors, etc being added.
There is also a hexagonal tube to be added to join the detention centre to the cells which can be seen in these pics.
The size of the inner structure is 27 inches tall by 27 inches diameter, the majority of the levels are 5 inches tall, but the main hangar level is 7 inches tall.
There should be 20 rooms including a main hangar (first pic) ,the ISP- 6 is in the smaller hangar in these pics.
But so far all good!