I use Sketchup for drawing out all kinds of projects, too. I did a full model of a small workshop I built last year (it was very useful in visualizing things like roof framing, etc), and both sets of raised bed gardens I've built. I found it most useful when I was building my kitchen cabinets a couple years ago, though. It was extremely useful to visualize the different options for layout, cabinet types, etc, and then when we finalized the layout and design, I used Sketchup to generate a cutlist for all the parts. Very nice software.