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Nice instructable!. For some persons the price of Rhino seems to be too high. But there might be an opportunity of going to a Fablab, Makerspace or Rhinolab (with a shopbot as well, that's more expensive item than Rhino).
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i built this on an arduino mega.i used, as recommended by some, a lab power supply on 3 and 5 volt, but it did not give good readings (out of range, wildly varying distances)i had to exchange echo and trig. i connected gnd and vcc of the hc-sr04 again to the arduino gnd and 5v.now it works finethanks.