How many things in this world are transparent and edible? Not a lot!!
Isomalt and gelatin are the only two things I can think of. The science of figuring out how to make them strong enough to support something means that they have to be big enough and thick enough to have strength.....that takes away from them being transparent.
If you google search 'sugar sculptures' or 'sugar show pieces' you should find examples of what experts have done using isomalt. I don't think it's what you are looking for, but than I don't think there's anything that's edible that does what you want how you want it....so more likely you'll need to make some adjustments in your design to achieve what you want.
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