i have thought about doing hood stripes like that. scuffing the area with steel wool to give it a brushed stainless appearance.
i cant imagine doing that much labor on an entire vehicle unless i was starting with new clean body parts and dipping them and disassembling the whole rig.
i hadnt thought about the UV issue, but even the most detailed job would leave you pin holes and thinly coated edges that would start to discolor and rust..
maybe for a show car i was building from the ground up, but not something already painted that will end up getting regular use and potential body damage.
but it would look pretty cool.
if you really want to try it, get a junk XJ for a couple bux and attack it with some paint stripper and see how easy or difficult it really is, and see if you like the results.
i'd be interested in seeing it done even if it doesnt bring the desired results, just to hear what you had to say about it.