It was hard to find a way of doing it with a great result at the end, and I came across a printable transparent resin. The company who offer that is Materialise, the same company I've already work with on the big Q9 and the Daltanious head, but didn't know they had such a material.
I've decide to give it a try even if it cost quite a lot, the idea of this clear Doublas with paper inserts is too funky.
Just picked the print today and as you can see it's not crystal clear yet as I need to clean it myself, sand it, polish it and varnish it. I was able to reduce the price by doing the post process myself but it's still hard for the wallet.
Anyway, hope the end result will be great.
Here's a few crappy picts done with my cell phone.
You can check the size on this last picture, he's 25cm high, so a bit bigger than the other print as I need to be able to polish the inner parts as well, and damn it has to be bigger.
More about it soon.