Complicated for me, Simple for you?

[dms04d]

It will be difficult for me to describe what I am trying to make, so below is a small picture I found online of it with a diagram.
http://img358.imageshack.us/my.php?image=aggrozd3.jpg
It is basically a miniature mountain (with flat sides).

The first picture you see in the model w/o light
The second picture shows what it looks like when it is lit up from inside with a green light.

I am looking for some sort of resin, epoxy... or whatever will work for this keeping in mind mainly the price and also the ease of application. I need the resin to be semi-transparent (almost a light fog), like you see in the first picture. That way you still see some of the green light inside even when it is off. But once lit up, the green light looks like it glows because of the somewhat cloudy epoxy.

As far as making this, I was thinking about making some sort of model of the mini-mountain (probably out of clay), and then using silicone RTV, I would make a mold of it. I was then thinking of putting the mold in a wooden box, and filling the box with some sort of filler. That way the mold would not be squeezed out of the original shape when filling.

Now here's the tricky part:
Once the mold is solid in the box, my idea was to pour the epoxy (or whatever is recommended) into the inside of the mold and somehow have the entire box/mold rotate continuously to evenly coat the inside of the mold. This (I think) would make it cheaper by not using as much epoxy as it would require if I were to make a mold to go inside this mold and completely fill.

I was thinking of having the walls be about 1/8 of an inch thick, and don't know of any other way to do this while keeping such a thin thickness.

As far as the solid base goes, I already have something worked out but I now just need to figure out the top, semi-transparent epoxy part.

Sorry if I make this sound confusing. I would appreciate any input. Thanks

[Geof]

Google the term "rotational molding" and you may uncover some useful information after a bit of reading.

What you are considering is an established technique commonly with thermoplastics. A split metal mold has a measured amount of plastic granules put inside and it is closed and then rotated around two axes in a sort of gimbal device and is heated. The plastic granules soft and fuse and coat the inside of the mold evenly all over because the rotation is around two axes.

The mold is cooled and opened and the finished object removed.

[kayaker43]

Geof mentions the correct process, but it can be done two ways. One is by rotating a metal mold (in two axes) filled with plastic powder inside an oven,.. the powder melts and coats the surface.

The other way is to rotate a silicone or other mold in two axes but using a room temperature cure epoxie or urethane resin to coat the mold as it hardens. Try searching rotational casting as well.

Try Polytek Development company for an appropriate resin.