Your shop with the lasercutter probably needs a DXF file. It is a vector format in actual size (1:1). It is easy to make with a CAD program, however the drawings on that site are missing some dimensions. Where is that rectangular hole located from the side? Also, I would only lasercut the bottom plate (10" x 28.25") from sheet. The sides would be easier/stronger to cut from 1.5" flatbar.
The image on that site is not to scale and the dimensions shown don't quite agree with each other. But here is a CAD file and DXF to get you started. You can view both with the free viewer on the Solidworks site.