BTW, here's the topic I started on X member design and frame bracing. If you are knowledgeable about how a strong frame should be built please take a look and add some input.
http://67-72chevytrucks.com/vboard/s...d.php?t=495785
Or, even if you don't have anything positive to add, go comment anyways so it stays towards the top and maybe somebody that does know their stuff will see it and share their advice.