When learning Solidworks I partially disassembled this toy that I got for Christmas one year - great to practice with! Each element allowed me to try a different modelling technique and we even got in some surfacing.
Hope you like it, try spinning the rotors - the self levelling dogbones on the upper rotors are fun. A section view will illustrate how it uses different motors for different rotors etc.
Only thing omitted is the fasteners and wires!