Drill press 2 or 3 pulley setup need help?

I'll have to make the pulleys out of 1045 steel, it's the only material i have a big enafth piece, you can imagine 12 - 15 kg of drive pulleys at speed, i'll have to put in a disk brake for emergencies, and as RJSakowski pointed out if i go little bigger on one side of the pulleys i could go down to 100 rpm and get much more torque, i already was planning to add flood coolant and a dividing work table, this project is going to take some time but be one of a kind, thank you all that replay and more suggestions are welcome.
 
making step pulleys is very complicated, making a matching pair of step pulleys is extremely complicated. If you use a 3 pulley set up, you will not need a matching set because the third pulley will tighten the belts in any configuration.
 
i'm considering putting the motor on a hinge and make a strong spring adjustable tensioner to tension both belts.
 
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