Thinking of making a hybrid army - need tips!

Hey Everyone,

As a Tyranid player, I wanna branch out into the imperium to see what's up on this side.

I'm simply thinking of making a Space Wolves army but adding some (non-codex having) armies into the mix. I was wondering if I'm even "allowed" to do this or not?

I was thinking of adding Salamanders (as they're also considered "good"), I think a green army would look great fighting along side the wolves.

What would be the best way to apply rules to this army? Do I simply make them all act like Space Wolves but some just have a different look to them? What point distribution should I aim for if I aim to get 3k points in total?

Any thoughts are appreciated!