u just need a clock machine. and all the cool stuff by which you want to make it look good.
u ll need-
a clock machine which you can buy or make
an old CD
some tires of u ll old RC car
a chain some washers
a big 30 cm steel ruler or any such metal piece
and any thing by which u can adorn it
fix the machine with the CD
and paste all the other material as u wish.
let it dry and u are done !!! :)