...I'm not too sure how to test this addon, but I will try.
The banana model seems fine to me. There really isn't much to model with a banana. The banana tree seemed...strange, though. Is that really what they look like? I've never seen a banana tree (banana's grow on trees?!
;D ...just kidding), so I can't really say anything on that. The only suggestion I can think of is to add icons for the banana objects in the mission editor. That big box with the question mark makes it difficult to place the bananas accurately.
...damnit, now I'm hungry ;D
*goes off to eat a banana*
-Pilot