Thanks for the kind words, everyone!
I got my Porterbuilt trailing arm crossmember the other night and my excitement level immediately went to a head scratching fest. The reason why I went with theirs is because of the fine adjustment in anti-squat, I actually have a model drawn up that looks identical to theirs, and when I pulled it out of the box there were only 3 holes. Not what I want. I'm going to decide whether it's worth cutting their brackets off and doing my own or send it back and start from scratch.
Their website picture, notice the "scalloped" hole design with a lot of adjustability
And what I got
They changed the design about 6 months ago and haven't updated the website yet if anyone is curious.