The mod is awesome and one of my favorite, but I'm a bit sad on one point:
I tried the mod with the Vivecraft mod (where you can play Minecraft in VR with the HTC Vive) so I could fly the dragon in VR (I needed to use the r41 version for 1.7.10 since Vivecraft with forge is only available for this version of the game). I don't know why but when I get on a dragon the camera just go inside it in standing and sitting mode. (EDIT: I found out that this also happens with horses so it's not the dragon mod that is bugged) In sitting, if I move the mouse out of the FoV to rotate the character left or right, the camera is back to normal until I stop turning and it goes back in the dragon. Also I can't fly the dragon with the Vive controllers since Vive controls and Keyboard controls are in different layouts (and the fly up and down controls are in the keyboard one).
I know this mod wasn't designed for VR (just by seeing the date it came out in 2011) and I can't blame the developper for that. Even though it would have been AWESOME if my little experiment would have worked as I thought.
btw my dragon was going through walls when it was juvenile and it was a pain to enclose it in fences w/ a lot of blocks behind them (that didn't work at all) + leashes weren't working.