(Sorry, don't mean to poke fun, just the image of that reminds me of looney-tunes)
Seriously though, I've actually been mulling over screwing the skins on instead of welding them. However, I'm also searching for reasons why I might ever want to change/remove/swap them. So far, only reasons I can come up with are cosmetic. Anything y'all can think of? Probably best just weld 'em on.