@cotty said:
With the attached image, you can do it like in this screencast...
See image above)
Thanks Cotty, that is exactly what I ment. I didn't have the right transparent png at hand. The texture can be resized to show any grid one needs, even X and Y independently π
Jim, if you are going to follow Box's suggestion I would advice you to go for limited construction lines, (limited in length) made by a plugin, written by Jim Foltz.
See his blog and look for 'Construction Line Tool':
http://sketchuptips.blogspot.nl/p/my-plugins.html
Thing is that with a few (not even that much, really) infinite guides in your model you might get lost in modeling space when orbiting. Even 'Zoom Extent' would not bring your model back until you delete all infinite guides.