Sigh.
....Because this is totally what the original idea was about, and Banjo-Kazooie: Nuts and Bolts was a total success!
Okay company, let's get one things straight, trailer are add. Normally you have to pay other company to force people to watch add. But see, some degenerate people, like me, will willingly watch your add, with no monetary intensive. So maybe, just maybe, the least you could do is not force us to watch an add before we watch your add??
Anyway, on the game. I don't think these "build your own crazy vehicle" can ever really work because at the end of the day, you need vehicle to be restricted in what they do so we have to go trough the level created. This means almost every change you can make are just cosmetic in nature and don't really affect what you make, at the end of the game, my crazy contraption will be almost identical to everyone crazy contraption, they might look different, but a car is a car and a plane is a plane.