Here's a few more images of how everything mounts up to the car...
Here's the purpose of that little hole at the end. Gives some leverage to get everything snugged down and secure. --v
Where the bars transition from 0.75" to 1.125", this portion sandwiches against the re-bar to provide added support to the bars and help to distribute the weight from the threads. I'll be using nylon washers between the bars and the re-bar to prevent metal on metal wear and minimize vibration that could result. --v
Here's how the 1UP rack mounts in the "channel" created for it on the bars. --v
And finally, here's the clearance of the rack to the car. --v