Cattle panels will work; Had a welder use old bed frames to weld them around the edges so they were stiffer to be able to move them. Did them in 8 ft sections so that it was easier to handle also. Then just laid one or what ever you need over the top and it's a moveable,pen that can be disassembled easily, sides can be tied together and make square corners or whatever. I have had Royal palms and they fly good, get up in the trees and did a great job of setting and raising poults. Toms never bothered them. Had Bourbon Reds that really flew even being bigger and heavier, but the hens were lousy mothers once the poults were hatched. They needed to be more contained and might've done better. Try looking up NH Poultry fanciers and see if they have a website. I used to belong to the club when I lived in Ct. and they had a poultry show every fall and you might find some other varieties of turkeys. Also, there is a HUGE poultry show at eastern states in springfield mass in January, called the Northeast Poultry Congress. Usually have 1500 or more birds. Alot of breeders sell surplus and if you don't really want show birds, might find some with faults that would work well. Also try getting the Poultry Press newspaper; has all the shows and show results, articles, and a classified section that will have eggs, birds etc for sale.... You can find all that on line also. We show at the va poultry breeders show here in va in Nov. I am a district director although the club isn't as active as it used to be. The biggest show is in Ohio in Nov. and you can find info on that on the web too. Usually 2-3,000 birds. Lots of poultry shows around to go look and get googgly eyed over some of the breeds...
If they are on the property they are protected by the dogs. 
