Calling All 55-57 GMC Guys! Need Core Support Help!

[addicted2dunes]

Ok, I've never seen a 55-57 GMC in person with the correct core support. I'm hoping someone out there has some good pictures of a GMC core support so I can see if I'm missing anything.

Here's what I have:





I know I'm missing everything on top to make it look like this:



And I just bought these two pieces:



Is this all I need to make a complete core support from image #1? Or is there more stuff I'm missing? If so does anyone have good pictures of what I'm missing or good pictures of a complete core support? Thanx