I'll have to dig up the pics.... I know I have em around here somewhere.
I ended up drilling and using some smallish hardware I had laying around to secure them, grounded the extra length down on the machine screw so it was level with the nut. Then a lil loctite even though they shouldn't be going anywhere.
I broke a few clips in trial and error (bending the clips for the proper tension). The clips come 5 in a bag and are the cheaper quality, but function fine. I used 5 clips per wheel, 4 hold well enough though on those ones I broke.
I also use an old skool trick I learned from a hotrod web site, and use black silicone (I always have some around for some reason) around the edge of the caps so they have a lil seal to them and don't wobble loose, but can be easily popped off with a screw driver or removal tool.
When I find the pics, I will post em up.
Also thinking I will be using your carpet runner trick on the side skirts, was gonna bed liner em but I think you have the right idea. How close does it come to the look of the old skool style (pics are hard to tell) and how much does it cost? I've got a lot of work to do on all the cars before March.