Hmmm...
Yes many things to think about- a good metaphor should do that.
Of course all these things- from the physical act of twisting and spiraling through your body, to astral travel, transformed sexual power, etc. are suitable attributes of "Dragon Body"- at least my take on it. The Dragon body I have learned is definitely a Tantric exersize and thus the transmutation of sexual energy, which then can lead to astral travel.
In the mediations I do where this very much comes into play- I have travelled many places, and definitely transformed sexual and other energies. Dragon body is also extremely effective at dissolving fear.

The wonderful thing about the Lung- as we should acctually be calling it- is that their temperments are much more subtle and tend toward less antagonistic states of mind than their Western cousins who had so much trouble with the Angelic choir of the Christian hierarchy. There are of course reasons that Dragons earned a bad reputation in the West- not all of it having to do with their firey nature. In the East, we have a different family of Dragon- the Lung (or "Long) who held much more revered status- due in part to their more compassionate nature. Another thing that also differentiates them from the Western Dragon is that their power depends more on their ability to become like a tornado whose axis can be anywhere in the sphere, whereas the W. Dragon depends up on more upon fire power.The Lung move like water and are more connected to water than the W. Dragon, while at the same time are also more associated with the Heavens- most especially the Tienlung. And so to emulate them is also the "soft power" of Ba Gua and other internal arts- the ability to mould around and opponent or obstacle like water. The association of Qi cultivation here is also relevent, as water is the primary carrier of Qi, or what in Anthroposophy we call the etheric. The image you invoke of the dragon flying through the clouds has real scientific implication- look here: www.star.nesdis.noaa.gov/smcd/....html, click on Pacific WV loop, and tell me what you see.

~P