FR121 Lemna Minor

A update of FR108. Changes: + Wheels are closer to the centerline. 2 pair of the wheels are placed only 3 blocks wide. And the rest of the wheels are placed 5 blocks wide. As a result, they are better protected by the armor without costing more CPU. + The first row of the guns are now front-mounted. Then I can place the sidemost columns of guns 1 block closer to the center, or say RS71, while keeping the total length of the gun array fitting the 10-wheeled chassis. + Improved gun protection. Except the rearmost row, the remaining gun's root block are well enclosed by either blocks or e-plates. + Part of the guns are using long single mount. This helps the guns that close to the front more durable. + Seat using a 2+3 trident shaped mount instead of 2 * 3 H shaped mount. Seat mounting threads are now all in the bottom level, good for low HP survivability. + Removal of low mounted T-10 e-plates. They would interfere with the wheels as I said, stopping wheels from being arranged as dense as possible and also cutting the armor apart and blocking the way of gun mount threads. Car design without them are much easier. + Added 2 skis for gun's diagonal protection. They are also CPU-saving ,low-CoM and look light compared to pure blocks to do the same work. The first 4 features above are verifyed on the FR115. I referred to DestroyThing again to layout this. The connection of the sencond row of gun are on the same level with the connection of the front-mount guns. Thus the overall height of the guns are relatively low, which is good for survivability. --- **Related Links** + [FR108](https://robocraftgarage.net/robots/157) + [FR109](https://robocraftgarage.net/robots/197) + [FR115](https://robocraftgarage.net/robots/244) + [my gun arragement](https://robocraftgarage.net/lists/15)