Attaching sheet metal to roll cage tubes

[parsonsj]

Guys, I'm working on my front inner fender sheetmetal. I'm wondering if anybody has any good ideas for attaching sheetmetal (.060 5052 aluminum) to roll cage tubing. I'd like to avoid welding tabs (hard area to reach, plus the tube is 4130 so I only weld it when I absolutely have to). The tube is .090, so drilling and tapping probably won't work.

I thought about Adel clamps, but I can't find a source that big (1.75). I found some slick aluminum bolt-on stuff in the Longacre catalog, but they are $20 apiece.



Sheet metal screws? Any other ideas?

thanks!
jp