Hi Krymis
Can we assume that the tolerances for the part are better than 0.0001 inch? If so then your best bet is to machine these at one go from bar stock. invert your drawing so that the largest bore is upper most assuming you are using a three axis vertical mill. Surface the top face and proceed to rough mill the outer shape - leave say 0.0005 for final trim after you have end milled the interior. Mill the interior to size but to a greater depth than required determined by the saw blade you have at your disposal. Trim the outer profile as milling the inner may have distorted the outer depending on the cutting pressures used on bringing the inner wall to dimension. Using a circular saw or thin wall cutter remove the finished job from the bar stock using small feed rates. It might be anadvantage to use a sacrificial inner support if you have problems with the surface finish which you have not specified.
May I suggest that you imagine how the part will be machined as you draw as CAD is only part of the designers thought proccess from idea to manufacture. Keep thinking and re thinking tolerances and finishes as every dimension needs both! Sorry to labour this point as it is so fundemental to the design process.
Have fun and stay safe.
Pat  |