Well for the holes, I created the rotor first then. I used a cylinder about 100 sides, and turned it into the final high poly. Then, I made 3 smaller cylinders and used polygon, combine so it can be one. Once I did that, I hit insert so I can get the pivit point and I placed the piviot in the center. I then went into the duplicate menu and for instance, I want 20 sets of 3 for holes so I made 19 copies and i rotated it 18 since (18*20 =360). So in your options make sure your rotation times the number of copies that are going to be on the state =360 and thats how I got them to go around the rotor. Once arround, I did another poly combine. The reason I made sure I was done wit the rotor 1st is because I used a boolean. If you use a boolean and try 2 do things like smooth, your mesh will be all screwed up so once I was done with the rotor, I did a boolean with the cylinders and thats what made the hold. I hope i help enough