Just to be sure I ordered an SFI spec book from:
http://www.nhraonline.com/wklynews/1...er/113002.html
I think it was 'bout $5.00
It has color coded diagrams of cages for diferent classes. Tube size wall thickness requirements all that stuff. I'm also hooked up with the local track to get their imput as I go, since they will be givin' me the final thumbs up or down. Learned that building the house. If ya' ask em' for advise along the way they're much easier to please when it's inspection time!