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+Belts pulleys much less expensive than steppers with gear boxes. And less backlash.
It's step down for the pulleys to get more accuracy. Work it out. 130 teeth per 360deg. Then 2 or 3:1 for pulleys. Then stepper 400 steps/rev. Then x32 interpolation. I think that's 0.4deg per step. There's a nifty spreadsheet on the onstep site.
I don't have drawings for my current mount. It was suck and see. Depends on the size of pulleys and what belt size you get. It was a fiddle for me as I'm not very mechanical.
I can pm about the steppers. But go for 1A or under as you are limited by the driver tmc2130/2100 or the drv8825 Bojan mentioned. I like the TMCs.
If you go onstep I have a spare MiniPCB (look it up) you can have. That's uses the teensy though and you more prefer arduino ?
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