Best cyclone dimensions for modified DC-3

Hi All ,

Im about to build a cyclone from sheet metal for a modified DC-3 blower , wondering what people consider the ideal cyclone size would be if running 6 inch pipe, like the barrel diameter and height ? also the length of the cone . The inlet on the fan has been modified to 6 inch the outlet will be roughly the same , i will make a new connection to the bag filter which will be 6 inch as well.

Ive looked on BP website and been looking at dust deputy.

Any ideas ?