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Hello everybody!
After having discussed the Capital Ships and the Starfighters of the Separatists, it's no time to complete the circle by talking a bit about the Separatist planetary forces. As usual I'd like to start with a small summary picture of what is awaiting you in this topic.
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All following images and bold vehicle descriptions are links to their image galleries and instrcutions.
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The origin of the Separatists Droid Army lies at the Trade Federation. Hence I'd like to start with The Phantom Menace and the Battle of Naboo. Suddenly there appeared large war machines on the peaceful green grassy plains of Naboo. Among them is the Trade Federation AAT (Armored Assault Tank). The mini model features all details of the bigger official playset including a moving turret which can also change its fire angle.
Also part of this battle are the Trade Federation's MTTs (Multi-Troop Transports). Realizing I didn't have one yet, I made this during the last week. It's much smaller than the official TLC mini model but has at least as many details including an opening front hatch.
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An important sentence by Count Dooku in Attack of the Clones regarding the strength of the Droid Army is: "When their Battle Droids are combined with yours, we shall have an army greater than anything in the galaxy." From this point on the Trade Federation's Droid Army was combined with combat droids from the other Separatist fractions. During the Battle of Geonosis we hence see a large variety of combat droids. Among my favourites is the cute-looking but deadly Dwarf Spider Droid.
Another more ugly looking spider droid also present during this battle is the Homing Spider Droid. The design is as simple as the one of its smaller cousin above but also represents the shape well.
A more tricky craft also seen on the battle scene is the Hailfire Droid. Its angled wheels were realized by using an angled TECHNIC axle connector. The wheels themselves are TECHNIC gear pieces. It's a great example that TECHNIC pieces are very important even for mini building.
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One of the major battles in "Revenge of the Sith" is the Battle of Utapau. Again we see more separatis vehicles. Probably a more personalize vehicle is General Grievous' Wheelbike. It's a very tiny model using a 3x3 TECHNIC gear piece in the center. It even features a seat for the driver.
A new introduced combat droid during this battle is the Octuptarra Combat Tri Droid. It was already seen in the first Clone Wars TV series but appeared in real here for the first time. It uses many clicky hinges and TECHNIC triple hubs.
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Another important battle in "Revenge of the Sith" is the Battle of Kashyyyk. Here we see the Corporate Alliance Tank Droid. Similar to the later TIE Crawler and TIE Mauler, this droid features treads. To be honest, I think the official TLC mini model of this droid was really bad. Agreed, the construction is very difficult but not impossible. Please have a look at the instructions to learn about the sliding technique used to generate a plate with studs on both sides. This model cost me over one week of construction time.
The reason why I titled the thread with "planetary" vehicles and not "ground vehicles" is the next model. It's a flying vessel, but bound to a planet, the so-called Droid Gunship. It features very compact weapon racks. When using hose and lever ends instead of the more thick 1x1 cones you can fit more rockets narrowly to each other.
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That's all for today. Thank you for your time and interest. Have a great week!
~ Yours Christopher.
I am glad to have found this nice place, forum and people here. 
A few more kommas, semicolons or fullstops in your lengthy sentence would also make it easier for non-native speakers like me to understand them more readily. Especially the last part of it I had to read twice to understand. 
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