To make a 3D CAD Model of a battle tank in PTC CREO 2.0

I am new to CAD ,i recently learnt part modelling ,assembly and surfacing in Creo 2.0 .I am interest
ed in building a battle tank(any) in Creo but i don't know where to start ,i need help in figuring out how many individual parts a tank is made of and how get their exact dimensions in order to assemble them.I hope i get some good suggestions.

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