I have been working on drawing a Les Paul style guitar top plate.
I've drawn my base outline on the front plane with all of the arches on separate TOP plane views with a coincident center arch on the right angle plane. I extruded the base outline to 3/16" and then did a filled surface using the arch geometry as guidelines for the surface. in order to do the cutaway/horn I created a separate sketch and attempted an extruded cut in 2 directions but I can not get the cut to go through the surface. It cuts through extrusion below the surface but will not cut the actual filled surface itself. I originally attempted to do the cutaway as part of base drawing but that reeked havoc on my surface.