Well you have certainly done a good job on it so far, to me, even though it dosn't suit your criteria.
A step back and let'n time for the dust to settle will give your new *** later on.
Just a thought (because I do this to myself all the time) maybe you should limit your approch to construction. For example, you started with opeing the door then later you mention showing the engine being removed. Sounds like going in too many directions at once. Deside on one approch, for now , get it done and try the other on the next model-wish I followed my own advice.