I use Silo as a modeler, not for rendering. When I need a render I usually use one of my normal render engines -  Poser's Firefly, Vue or Studio's 3Delight. Every renderer is different, so I usually check the model with the rendering engine I want to use for the final image. Sure, you can link Silo to a rendering enginse, but still you would have to adjust the materials for a good look, and probably the scene as well. Reflective things like metal just don't look right if there is nothing to reflect around.

So, my advice would be to use Silo just for modeling and creating UVs. Use your preferred renderer to generate rendered versions. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.