Looking good! I have a lot of work to do to get mine looking that good.
White plati-dip is garbage. I have tried multiple times to use it on multiple surfaces and it never turned out.
As for bags, that is the way I'm going. Like kronik said, if you get a quality system and run the lines proper and don't let the bags rub, you will get a good setup that will last a long time. Also good to look into going through your suspension components as well if you haven't already. I know a lot of people who run them in their old muscle cars for track use. As long as you have good shocks you will have good response. You slam it and you have perfect center of gravity so spring rate does not matter. The bags pretty much keep you stuck and any slight bump in the track is absorbed by the shocks.