I don't suppose anyone has any connections with Pinewood do they? You could see if there was a department or society in one of the Scottish universities that'd be interested in trying it, it's possible if you have a really talented director/cast/crew to make a really low budget classic.
Personally part of me wants to see in made as a CG animation. The idea of a city in sky is very suited for the Final Fantasy production team and they'd pull of the colours perfectly. Bright for the new world, dark for the undercity. But that's just as unlikely as Hollywood making it.
Sorry, it seems I can't edit the size of the pictures. Double sorry to anyone trying to load the page on a PDA.