My latest project is in the more small terrain pieces(fx something to place between all your cool buildings) And today's model is a futuristic cargo container, I got inspired to do the other day, seeing what I believe is some kind of generator.
So I made a model in sketch up to get an idea of how I am going to build it.

(Space marine only for comparison and not included)

I am planning to one of the sides and the cast it in resin since the container is octagonal it should work fine, and save me from a lot of work. Plus it will give me the opportunity to replicate the model, to make all kinds of cool pieces.