Estimated Lidar parameters:
360 measurements per rotation (1 deg angle resolution);
Maximum distance - 4 m;
Calculated accuracy - 5 cm at 2 m, 10 cm at 3 m (I hope that it can be improved).
I suppose that the price of all needed parts will be near $35.
P.S. Sorry for my bad English - I am from non-English-speaking country.