Thanks for directing me to your build thread, I plan to do the same thing with my quarter panels. The worst rust on my 62 are the rockers and rear quarters so I'm chopping both, I like the way you capped your quarters, I'll likely do the same thing. I'll also add wrap-around "wings" to my swingout bumper to protect that area.
I was worried about doing the body mounted "sliders" but I've seen more and more guys do it and everyone seems to be really happy with them. As a bonus, I don't have to get rocker patch panels and screw around with a bunch of body work.