Having it raised and with a 3/8" border will be a taunting task, at best. I opened the .dxf file in SketchUp with no problems and checked it out. On a 8x8 piece of wood the max bit diameter you can use is 1/16" and maybe even smaller. To pocket out all the material you don't want with a 1/16" bit is a chore since you'll have to have the bit do an overlap when pocketing or the final result will look like grooves and not flat. In this specific design, the bigger the piece you use the easier it will be to do.