Well, after showing my entry to a couple of friends and none of them getting that the subject was infact a large rocket, I headed back to the Museum to try and re-shoot it and possibly get the fins in frame as well this time. Even with a viewing angle of 96degrees through my lens I was still having really problems getting the whole thing in frame, in any interesting and unobstructed way. After rolling about on the floor of the museum on my back I finally got something that I think shows the subject to be a rocket more clearly. I'm not sure that I like it as much although it's certainly a rocket now.
Edit: Entry now changed and settings updated.