This is not enought, because you have to send at least one angle. And now think about sending four arrays with indexes ot 1000 every frame. If I callculated it correct, you will have a transfare rate of 250 mb/s ^^
And you also have to send the animation states and much more...

Even if you use death reckoning it will be much data. Because of that you have to split your whole gameworld into small parts so that you only get the data of the players which are in your part.

I don't think that coding something is impossible even for a small team, but your whole game should be made well because a MMO game with only 3 players isn't that cool
-> I don't think that the technical thing is the difficult part, but getting a lot of people who plays your game

Dark_Samurai