Gotcha, thanks for the pic. You aren't using OPs rack, that's what confused me. I like your design, clean and simple. I wound up ordering the same rack as the OP, https://www.amazon.com/gp/product/B00FQT1FF4/
Hello wokka and welcome to the forum. You'll find the people here are more than willing to help and answer questions. It looks like you're finding your luggage solution for the top you are getting. You might want to post up on the new member thread and you're likely to find some riding partners down there in Tejas. Cheers!