This game needs a view orientation to surfaces. Since all the objects line up on their surfaces in the order of things when you are positioning something off the grid you need to be sure you are looking perpendicular or parrallel to a surface as you line up the next item. In 3d Cad programs this is take care of by selecting the command and clicking on the surface you wish to orientate your view too. This would put your view at 90 or parallel to a surface so you can be sure the next item or object is aligned. Otherwise you get a view skew that is hard to assess if you are really lined up correctly.
Maybe this should be a fly only feature as it would be easier but that would not be as fair to all player types. Lining up is important to make things look right in the wood world.