Welcome! there are a lot of knowledgeable, helpful folks on this forum as well as a wealth of information. Here is a link to the 67-72 Suburban section:
http://67-72chevytrucks.com/vboard/f...splay.php?f=38
There is also a link to the Suburbans and Panels build projects from the above link but providing it here for convenience:
http://67-72chevytrucks.com/vboard/f...play.php?f=212
Using the 67-72 Chevy trucks search option will be one of your best friends in finding what you are looking for. btw - nice panel and congrats, please post some more photos (exterior/interior) when you can.