Just a suggestion for metal linkage for your props. I know you can use a variety of things like pvc, metal, aluminum, wood or even string. I just bought these 1/4" thick by 3/4" wide aluminum bars. All 12" long. You can input all kind of sizes or lengths on Ebay. I got 10 for $18 free shipping. Pretty cheap in my book for sturdy linkage. Just a suggestions. No, I do NOT sell these! lol.