To my knowledge, Flight and slithering things have been tried many times before with the M&B engine Warband and vanilla.
I'm pretty sure noone has ever managed to make something fly without looking incredibly stupid. While the snakes would be very hard to do I imagine.
Don't fret however.
If it's possible to do it, and make it look nice.
I'm sure we will have it in the mod. This has been asked for at least a few times in the past.
Just more evidence that people think it would be cool.
[EDIT] on my thread settings, this is the first post on the 100th page. Booyah!