Many thanks to Shawn Wallace who helped me complete my introduction to using AS220 Lab's Epilog laser cutter this afternoon. I was able to cut 8 building of two different designs on 12" square, 1/16" thick chipboard. Next step is to assemble them to see how accurate mine and SketchUp's measurements are. To be fair, however, the conversion pipeline between the SketchUp drawing on my MacBook and final output to the cutter is very long -- SketchUp to PDF to iDraw to PDF to Corel Draw to Epilog driver to Epilog hardware.