I looked on your profile for an e-mail address and didn't see one. Pigeons trap's are easy to build. Wire on all side's and opening's on all sides. Above the opening's hang a set-up of swinging bob's that open only in. After you set the trap, hook the bob's UP and leave them up. Then put feed inside, in the middle of the trap and sprinkle a bit around the trap and the opening's. Leave it set that way until the bird's get used to eating and then drop the bob's down. They will push the bob's in to get to the food. I'll go out to my pigeon house later a take a photo of a set of bob's. Hard to explain them but easy to make.
By the way, you'll catch it from some people for training with pigeon's but the are the best, no make that BEST, bird you'll ever get to train a bird dog. Nothing bad ever happen's on a game bird that way, the pigeon's keep comming back for more and changing to game bird's is a simple step. Two big big things to remember, pay attention to what your training and never, NEVER, set your dog up to fail.