This is great, thanks to you both for sharing your designs. After much troubleshooting of rod storage last year, I think this is clearly the way to go. The T-90-90 was what i was missing, and the pin to hold it together is great. I like the rod leashes too, and the way the middle two rod holders have lower extensions that can help support their weight against the kayak.
The screws allow you to make changes down the road. I have adjusted mine several times!