This is the result.
The front side with activated light.
The back side with activated light. I just drilled a little hole into the plastik to get the power line though.
As you can see it's only a to metal plates and thin red colored plastic. A light ball would have been to hot and melt down the lamp within a few minutes, so I used this. Later on I should insert a LED base light ball, which save energy and isn't getting that warm.
Just a top down view inside. As you can see it's quite simple to make trash light up!