I use these Plano boxes for my terrain currently (more can be read
here)

As for larger items I am about to make, such as forests and craters and "pre-built ruins on stands", I'll be modifying my 28mm storage for these.
Basically, I plan on all these cases fitting into a large 20-30gallon storage bin. One of the smaller cases will be for larger template-style terrain (see the last pic in this post).
This is how I store ponds/forest bases at home: Basically I cut out cardboard and made slots for each item to fit in. In this drawer it is more free-fitting, but in the mobile Epic storage the cardboard will be hotglued in with a felt or other cloth bottom.

Here is the 15 Quart/14 Liter box in a size I plan to use for the forests...

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http://kealios.blogspot.com/ - My blog of my sci-fi adventures