Building a frame jig - need advice!

[Twalker]

Hi all, this looked like the best place to post this - let me know if it should go somewhere else. Was hoping those with some experience in building frame jigs could have a look at my post in my build thread and comment on my approach and the questions I raised? Thank you!

http://www.forbbodiesonly.com/moparforum/threads/project-unicorn-1968-charger-restoration.144166/