vic, you never seen these before?
i first built my dual strat jackplate a long time ago and know i have shown it here, i passed what i did to brian at jack of roses and he sold them for a while. wonder if that is where scott got his. also, brad also did this an even longer time ago, and instead of a metal material, just used pickguard material to fabricate it.
just pointing out the fact that scott walker is not the first to use this. take a look at mattson's strat or jackofroses old page or the archive here. this has been an alternative for quite a while.
just a little perplexed you haven't seen these before.
"The process of selecting the tone on the guitar is an aesthetic process like any other, so you try a lot of different things. Most of the things I’ve tried I’ve tried in live performances" ~ Jerry Garcia