Shiroi... do you work at, or know someone who works at one of those factories in China where people like the people I work for send their stuff to be manufactured?
Just asking because you seem pretty knowledgeable about this kind of stuff. And you're in that side of the hemisphere.
And yes, clear plastic (or making the entire thing clear and painting certain parts of it) would do it.
Of course, I would not make the Inverted Castle. That's craaaaazy (the regular castle though? Perhaps).