A lot of expensive taming tips here... Here is the easiest cheapest way:

1 stone foundation

3 double door frames and 1 ramp...that's all you need...no behemoth gates that cost an exorbitant price....

Place the foundation and one double door frame on a side. Place a ramp on that side. On the opposing side, place 2 stories high door frames. It would look like this (somewhat): |_i\

Run straight through the trap and go between the door frames...ta-da...

Also, you may wanna kill carnos first with an argi...and bring a lot of tranq amo...