Hi Dee,
For this kind of part, I measure and create line edge for each side (using MLCad). Then I build the top skin using Coverer (http://philohome.com/isecalc/coverer.htm).
I have created a lot of tools in this spirit that help parts creation (http://philohome.com/ldraw.htm), and Michael Hidemann has created a GUI around them (and other useful tools such as Windz to BFC parts, or Stl2dat to convert 3D stl files to LDraw format), LETGUI. LETGUI installer contains all tools binaries.
For this kind of part, I measure and create line edge for each side (using MLCad). Then I build the top skin using Coverer (http://philohome.com/isecalc/coverer.htm).
I have created a lot of tools in this spirit that help parts creation (http://philohome.com/ldraw.htm), and Michael Hidemann has created a GUI around them (and other useful tools such as Windz to BFC parts, or Stl2dat to convert 3D stl files to LDraw format), LETGUI. LETGUI installer contains all tools binaries.