I make mine out of sticks and brush. I live in TEXAS, and you can always find dead wood of sometype. What I generally do is find a bush, tree, big rock or catcus as a backing. I generally try to find one that has a natural hole in it. After finding the backing, I use handheld brush trimmers to clean out the hole. I like to have a hole big enough that the cat can think it can go into and turn around. I them make my cubbie. The cubbie is shaped like a "V" with the point going into the back of the brush, rock or tree, they do not need to touch. I usually make mine 6 ot 12 inches high. I then place the trap in the mouth of the V and use guide sticks on each side to the trap. I take a rock, cow chip, piece of dead wood, or bone and place my urine on it. Approximately 8 to 9 inches from the pan behind the trap.
It works for me, the key is the backing.
Good Luck and God Bless you and yours,