Sounds like your having a lot of fun. The way that I would go about doing something like this would be to get all the sketches that I wanted in the drawing file shown and delete all the hatching to eliminate this problem that you are having. Then I would copy and past all the lines into a new part file on my sketch plane. I would then use this sketch as a referance to model my part by starting a new sketch on the plane that I pasted the original sketch, then converting the profile that i needed for my starting extrude. Then I would do the next profile that i would need till i got finished.