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I was thinking that too, but even when its thin the ship looks too wide for the distance between chains that would hold it up.. I might have to do something custom..
I don't think it would look right with the RTP ship charset, or even an edit of that, as that is traditional pixel art, and this is not. It looks good, though.
The way I designed the original hot air balloon, it wasn't really intended to be stretched or edited in such a way, so it's going to have noticeable flaws. My original still needs fixed up a bit as well, so it's not the best base. I would by all means suggest using something else as a base.
Euphony is correct... I do like the way your going with this and all but original is better, be creative... I'm making my own ATM (as we type XD) I hope to release mine very soon!