Sorry, I cannot help you Bret. I have the 680 Rec Tec second shelf and use it all the time without a problem. My biggest cook to date was 65# of pork butt, and the shelf really came in handy for that cook. I had the bottom shelf full with 5 butts and an additional butt on the second shelf. I could have easily put another two, possibly three butts on the second shelf to get close to 80-90# of butt on the pit.
Thanks. No doubt the Rec Tec shelf works, I was just curious if anyone has tried to make their own. I did make a small one out of a stainless steel cooling rack and some stainless eye bolts for legs, but I want something bigger.