I probably will be auctioning my "Footsee" acetate at some point, but your trade offer is tempting. Then again, I have no idea what a work-in-progress acetate of "Footsee" will fetch, you never know what kind of value people will put on such a thing, taking nostalgia things into account etc.
And oh, the "Footsee" one is a metal acetate so you'll need a LOT of heat to make it into an ashtray!