Hi henk,I think that MarkA is offering some really good advise.That car is a great starting point.I've done everything to mine except jumping up and down on it.Also,don't think for a minute that all parts are interchangeable.Some are,such as wheel/tires within similar cars,and keep in mind their are some counterfeit or copy cat car makers out there and who knows what well fit them.And by the way,keep in mind those words;Pre-built.