The difficult part is the cockpit interior. It prevents any support structure from going straight through the build. I'm thinking about adding a simple big rectangular tube which protudes straight from the nose section behind the CI through to the engine section. So the engine section has a hole at the front, the nose a rectangular tube at the rear. That way you'll ensure a durable connection which also will guarantee that the both parts are assembled straight. Like the neck tube on Crichton. 
