Basically it's like a slow-moving vehicle with a raisable forklift, or unrealistic hydraulic lift. It only has two modes, one for when you're raised up (slower) and one for when you're lowered (faster).
When you're raised up, you have a designated hotkey, I'm thinking something like, it's a 1-person vehicle, and when you go to switch (, or .) you either get raised up or lowered down. The steering, I figured, should be accurate, so you don't go killing yourself trying to snipe some other players.
It is actually based on a real vehicle--the real thing actually is used in prisons, where a guard goes inside the lift and watches over the prisoners. It's kind of like a cherry-picker with a closed box, so you can't get stuff thrown at you through the inside. I also think that it should have a high amount of health, so you actually have to shoot the player inside, instead of just breaking the vehicle.
Overview:
1 person
Two modes, lift and non-lift
And, the modes involve slower and faster speed, with both accurate turning, respectively.