This is my idea~

It should come with a Wrangler. This Wrangler however, is a bit different. It replaces your secondary slot. But when you have it on, you control your Mobile Sentry. You can turn it and shoot it. But when you have it equipped and Crouch with it, you enter this kinda HUD. Therefrom you control your mobile sentry with WASD, Shoot, and turn it. To go out, simply stop crouching. But what about when you arent equipping the wrangler? Then its just a normal stationary sentry, that shoots targets within range. When you are in this HUD, teammates have a green square at their pelvis, and enemys have a red one. You can only see this red square at enemys who are within the range of the sentry. But you can still shoot them of course. Disguised/Cloaked spys of course doesnt have a red square, and disguised spys have a green one. If you are disguised and cloaked at the same time, you wont have a square. If its a teammate spy thats disguised/cloaked, it will simply have the green square. So long story short, if youre on RED team, all REDs have a green square, and BLUs have a red. Inivisible spys have none. Now, lets talk about the upgrades. It should be able to get to level 3. At level 1 it should simply have a level one gun. Level 2 = Level 2 sentry gun. Level 3 is one level 2 gun, and one level 3 rocket thingy. To build the mobile sentry, it costs 200 Metal. It costs 200 Metal to upgrade it, and 200 metal again. So 600 Metal to get it to level 3. Now, when its bieng controlled with the wrangler, doesnt have to be crouched and steer it, it gets a shield. This shield is the same as the normal wrangler shield. But when its in the shield, it has a 20 percent weakness to sappers. When your MSG is bieng sapped, your view gets wierd, and you move slower and fire slower. Now, the MSG has a fuel mechanism. You can see the fuel at all times. The fuel can be refreshed by hitting the MSG. When the MSG is out of fuel, it simply gets disabled. It gets a 10 Percent Weakness to all long ranged attacks, and 30 percent weakness to melee. You automatically goes out of the HUD when your gun is out of Fuel. So be careful where you take your MSG. If you simply just stand back at your spawn, your gun needs to travel so far to the front lines, that it wont do very good. Your fuel drops when your guns wheels are activated, aka the HUD is activated. This makes us come to the fact that you can just pick it up and move it. Now, i think it should either be unpickupable or the engie is very slow when he picks it up. I think it should be heavier the higher level it is at. So at level 1 he gets 30 percent slower, level 2, 50, and level 3, 70 percent slower. Now, lets check up at the stats. It should have a slower building rate, maybe a 20-30 percent slower building rate, it should have more health, but a less firing speed overall. It should maybe also be a bit slow, maybe 75 percent of the heavys normal speed? That sounds pretty reasonable to me. So yeah, what do you guys think?