This is an instructable just for YOU and it is about how you can make an underside for an arcade machine (sorry for not having any pictures I don't know how to take screenshots on this computer).

Step 1: Step 1: Find the Dimnensions for All of the Sides and Figure Out How Big You Want It to Be.

You want to find the side for the bottom, top, side, and smaller side

and figure out how big you want the thickness of the cardboard you want to cut.

Step 2: Step 2: Making the Bottom Side

Start by making the bottom side in Fusion 360 because then it is easier to make the other sides and use the bottom part as a guide.

Step 3: Step 3: Make the Side Part

Make the side part infusion 360 next because then it will be easier to make the smaller side part.

Step 4: Step 4: Make the Smaller Side Part

Make the smaller sied part in fusion 360

Step 5: Step 5: Lasercut the Parts

You will want to laser cut all the parts two times so and make sure that they all fit if something doesn't fit then you will need to adjust that particular part in fusion 360.