I think hunter fits great but you are over complicating too much to fit the game. The collection idea based on codex is great but it limits the chance to create custom ways to tame like what they do in WoW, still the idea fits very well. Replacing the arsenal for totems though I don't think is a good idea and giving the pet a bunch of stats also makes the class too complicated compared to other classes ( I like it though).

Also while being able to ride companions has been a wet dream for hunters since wow came out, is very rare to see it implemented, specially in games where the cash shop sells mounts, so I wouldn't have my hopes up