I made a pair based on his design (I assume you're talking about the in-line pipe style) but used 1 1/4" pipe and low-pros instead of a speedrail fitting. I'm happy with them, but I chose that style because it was easy for me to DIY, which in turn allowed me to play with the lock height and angle for my set up.
I have exchanged emails with the proprietor and he was very helpful to me, including sending pictures. I think he follows this site so you might hear from him at some point.
"If you dont do it this year, you will be one year older when you do"