This was my quick and dirty Landspeeder X-34 for my sons 6th birthday party. I didn't plan on an instructable, so the photos are a mixture of construction and deconstruction. (it took up ALOT of room, I needed the garage back) It's also my first instructable, so excuse the rough edges.
The first step is to find a suitable chassis. I used an "Original KettCar" that we already had. I know that they have several models and sizes. It's pedal powered, although some of the younger kids needed to get a little boost to get all of the mass moving. Once you have your chassis, you need to identify your mounting points where you can build your sub structure. this method could be used for any sort of bodywork, although it could get quite heavy the more structure you have to build. I'm not sure how much more the drivetrain could handle.