Here from my point of view the more easy, totally free, funny and ultra powerful workFlow...Scape
Only direct modeling inside free BricsCad Shape : export in FBX (whitout Scale) Favorite Modeler possible of course! Moi3D!
Reload the FBX inside the Free PConPlanner : use its cornucopia terrific direct Catalog Objects, Textures, Materials
by Drag & Drop ! Save as OBJ
Et voilà!