The slotcar chassis fits very neatly. The original front axle is re-used from the toy car but a new rear axle with proper slotcar tyres is fitted; this is more in keeping with the narrow front/wider rear wheel set-up of the real car too. There's provision for fitting a traction magnet in the chassis as well.
You can buy just the motorised chassis, driver figure & interior moulding if you want to convert your own Maisto Smart & so save on shipping costs!
Full instructions are included - the only tools needed are a small philips screwdriver, adhesive & some scissors.