is this project possible?

i want to create a mod that is not really big but that add quality things:

if you already saw how to train your dragon, you know what is a night fury, and it's what i want to make: a mod that add night fury, light fury and variants to minecraft.

if i say this here it is because i want to know if all the thing i want to do are possible or not and i need an help on all the thing i say here because i am starting mcreator.

i know its a difficult project but the most important thing for me is to understand how to change the animation and the textures in the "coding console" that look like Scratch, how to use number variables, and how to creates projectiles as a mob attack.

afyer thinking i need help on all the thing i writed here...

i want to know for this thing:

i want that the mob nightfury spawn in a structure in the overworld, and is unic, like a boss (there is only one mob in all the party) and he can be tamed like a horse.

for the night fury spawning, i want that he spawn on a big structure, but that he dont leave her or go back in her for sleep.

the nightfury sleep on day and is active on night.

the night fury fly and the player can fly on him and guide it with mouse.

for the nightfury flying:

if he go down there is an animation and he is faster

if he go on a side  there is an animation and he go slower

if he go up  there is an animation and he go slow to faster

if he go from ground to water there is a aniamtiln and for swimming there is an animation

he have respiration like a player

for the tame dragon:

if the player shift click on it a gui open with his home point that we can set, his gender, his age, his position (sitt, follow,sleep,wandering...) that we also can change and 4 slot for his armor.

he can be regenerate with dragon medical cream.

one of the most important thing for me is that the nightfury can do animation without reasons (like sometimes with aleatory variable or something like that an animation will be played) like he scratch or he sneeze or he make his roar during flying, walking or sleeping.

i also want that if we right click on him with a dragon grass an animation is played where he fell on the ground.

dragon attacks:

there is not a lot of attack, there is 4:

the 3 first are easy: tail attack, claw attack, and bite attack (an animation with damage)

the fourth is really hard to do

he use plasma ball:

an animation is played for say he will use the attack (he charge his mouth with plasma)

when the first animation is finish another start where he do a head movement and in the same time a projectile (plasma ball) is send extremly fast and when it hurt an entity it explode and deal extremly big damages (50) but if it hurt a block it just make a big explosion xith blue fire and the cooldawn of this attack is smaller than 1 seconde.

alpha mod: 

when the night fury is under the middle of his life, his texture change and he become an alpha, at this moment all his stats become double, all the cooldown of his attacks is divised in two, his life is 3 times bigger and his regeneration his really better.

the other mob will just have different texture or model so i dont need help fqor them.

if someone read this and help me, know that any suggestions are good and if you send video know that im french so i dont really good understand english but im not too bad.