I'm looking to build a form from which to make GRP shapes. I think the way I'll go is to build a male from sheets of foam, between which will be glued sheets of thin ply cut to the contour at that point. I'll hot-wire cut the foam from edge to edge of the ply sheets, fill/smooth/paint the form, make a female, then make the final items.
So if there was a simple freeware cad program that would let me make a 3-d image and then "cut" it at 2" slices, giving me the plan view of each slice, that'd be perfect. Is there?