Getting a bit behind on things here, so time to update things.
Here you can see everthing just "stuck" together, no glue.
Now in this last pic you'll notice a bit of a step, this will disappear with some gentle pressure when gluing things together, as you can see here how the plastic has discoloured with the stress of being twisted, there are no cracks, this plastic is quite malleable and doesn't totaly spring back to it's original shape once you've got it where you want it. Of the few models I've managed to find that were built the common theme is very poor fitting requiring a lot of sanding and filler. This is true if you expect the parts to fit exactly right off the sprue, they don't. But they will fit very well once they've been bent into shape.
Here is why you don't want to fit and use the exhaust ring to keep things in shape
I found that I had to shave a bit off the ring to allow things to squeeze together
I also decided that it would probably be a better idea to paint the bays black to more or less hide the lack of detail in there
The joints won't be perfect, but the way it looks can be construed as less then perfect panel fit and I am going to scribe the engine access panels a bit deeper to sort of "fit the theme".