I am fairly new to the SW world. I do know that it is much easier to draw each part seperately, then assemble/mate them into an assembly. I'm curious as to how youcan exit the sketch and then rearrange you're features/sketches. If you want to change things around isn't that editing or changing your sketch? Could you post your drawing? i may be able to help you out. I have been through the basic modeling and sheet metal courses, if I can't figure it out my instructor probably can.