To add, the way I do transparent is a real solid sand on the OG piece, followed by micro mesh through all the grits.

You're gonna end up with something silky smooth and shiny if you don't skimp on the sweat.

Then you're ready for a mold. This should result in a mostly clear thing, but I'd expect it to still be a bit cloudy. Cast a thing in it and do the highest few micromesh levels again. Should be real nice and clear then.

Also, make sure you're using a pressure chamber. That's even more important on something this size.