Personal Story: My parents wouldn't let me buy my own electric scooter, so I built one out of stuff we had around the house.
P.S. Keep Dad happy. Buy your own cheapo cordless drill at Harbor Freight and don't use his!!
Okay, onto the parts list.
> A cordless drill (the bigger the better)
>A simple push scooter
>A piece of stick-on velcro (you will use the scratchy side only. If you can get it use rubber tape.)
>A rectangular piece of wood or plastic (this will support the drill)
>A whole lot of zipties
>A bicycle hand brake and cable (for the throttle)
Here is a link to a video of the scooter in action.
Step 1: Remove The Brake Pedal
My scooter had a small pin on the brake assembly that I hammered out with a small bolt and a hammer.
Your scooter may have a bolt and nut or something like that and it shouldn't be that hard to remove.
Before posting this, I tried to make the scooter with the brake pedal still on. It presented many challenges, so I removed the stubborn thing. Removing it made everything easier.
After you have done this you can move onto the next step.