Hey there! If you're looking for something that lies perfectly in between Sketchup and Open_SCAD, take a look at FreeCAD. As the name implies, its free, and it takes the easy to use tools of Sketchup and adds the accuracy of Open_SCAD, just in a simple, non-programming way. Obviously you'll still need to find some lessons online for FreeCAD, as I have done all of the tutorials and am still learning how to get around.

http://freecadweb.org/