I laser cut the Gettysburg Address into a 8" x 12" Marble tile from Home Depot. I need a stand to display it. I took the simple IPad stand and imported the dxf into Visio. I then converted it to Visio objects and then shrunk the file down until the slot was 1/4 inch, the thickness of the acrylic. That happened to make it fit just inside the piece of acrylic. The slots also magically fit the width of the tile (.34").
I then added the image of Abraham Lincoln, even though he is hidden when the tile is in place.
Note Visio gave me issues when trying to cut it on a Universal (the printer so no lines to vector, just raster), so I switched the Epilog (yeah the Garage is awesome) and it worked fine, except the little bit that was out of print range, apparently. I did a quick .1 " cut to knock the piece out.
More details at my blog

If you need to change the sizes, open a editable version, or just used the PDF.
Most likely you will need to check the thickness of the material you are cutting, since it becomes the size of the slot needed. I made this slight less than .25 (like .24) since the material as measure was less than .25.