This diorama is of planet Katina from the Star Fox series.
About this creation
Katina is a mostly barren planet. In the Star Fox 64 level all there was was a base. In Assault, green areas with strange mushroom like organisms were visiable in the distance, but for the most part it was still barren. Then come Star Fox Command, and there are cities that are almost exclusively brown, and use mostly one uniform building. There are also oceanic areas. The cave area did not appear in any game, and it was just my added touch. However, it does fit when you think about it...
Katina is the third most colonized planet in the Lylat System, the first and second being Corneria and Zoness, respectively. However, Katina is mostly barren, so it wouldnt have many resources. So why would Corneria colonize it?
So, anyway, the shape of the base is not a rectangle, but if that one forth was not cut off it would be 128 x 128. It uses 6923 bricks and would cost $1895