I first designed the arcade machine using "Google Sketchup", its a free downloadable program and is a great way to see what the final product will look like. It also has a 'Dimension' feature so you can see roughly the size of the pieces you need to cut. I ended up rounding off the dimensions to make things simpler. So don't use these exact measurements,rather see what looks good and use common sense. Don't make the frame too thin or it wont be sturdy but don't make it too thick or it will be too heavy (unless you don't mind that)
Measure twice cut once.