In case you're interested: http://forum.blockland.us/index.php?topic=268205.0
We have code to make the player using a dragon able to "jump" again in the air.
It isn't super complicated and can be easily implemented.
If you need help with that, send me a PM.
It might be interesting to contact us about the flying deal because we had some thoughts about it and we got something slightly more interesting in the works. :)
As for your collision problem, it was the first thing that popped into my head when i saw the model.
Sadly, collision boxes are a bitch to work with (or so i have heard) in Blockland.
Having the wings and stuff attached as items could work, but then it gets harder to animate them together with the playertype.
It still can do animations and stuff, you just can't really do like specific animations for crouching or whatever without it being very hacky.
Collision boxes can be different from the shape and size of the body, it will just cause that some parts will be able to clip the wall however. :/
The model so far looks great though, can't deny that.
It looks big and majestic and i would love to see the end result.