I present you with a fairly accurate and almost complete model of my Octuptarra magna Tri-Droid. This definitely one of my favorite droid artillery, but looking at it from a strategic perspective, I do not see how a tripod has a good advantage over anything.
About this creation
I used the Death Star from the planet sets. I later plan on using a useless planet, ("cough" Endor) and painting it gray with other details to have a more seamless look. The planet sets were the perfect pieces, as they are spherical and very very light compared to brick built spheres. Credit goes to Separatists Sympathizer as I pretty much based mine off of his, though mine is a bit smaller. As well as many others who have built some amazing Tri-Droids.
I am not too thrilled over how the guns are positioned, but they will complete the look for now.