Thanks for all your help Pilou, from what I read it would be easier If I redraw everything with Bezier Splines?
Since I'm starting this project from scratch I could try to master the Bezier splines if that would make it easier to work with the skinning and extrude tools.
Thanks again for all your help with this, I will try some of your suggestions and will look a bit more in depth to the TiG Extrude tools, this part works with another part but maybe I can make them work together using this extension from the start. One of the handicaps I had before was quality of surfaces, I 3D print my projects and the less curves I use the less quality I get on surfaces.