@Nighthunter - while it may be hard to believe, my grasp of English is actually much better in verbal communication (I noticed I'm making lots of errors during writing, because I'm starting to "think" too much
- not mentioning typos). Problem is, that with idiomatic expressions, until You know that particular one, there's often very little that could help You with finding out "what the author had in mind". :/
Btw. after closer inspection of photographs of Ae-45 on Airliners, I'm inclined to say, that the cross-section of it's fuselage in the rear part (between the wings and tail - which is the only part where making difference between upper and lower edge would be workable) seems to be near-oval anyway.