All Velcro is made up of 2 different pieces of fabric that stick together. Generic Velcro are called "Hook and Loop" fasteners, so I will use this terminology to describe how I mounted everything.



First I cut off a few pieces of Velcro that were the length of the Acrylic board. For each piece of the loop side that I cut, I cut a matching piece of the hook side so I could stick them together and cut strips at the same time. This Velcro comes 5cm in width, but I wanted it to be about 3/4" wide, so I laid it out and cut it into strips with my straight edge and a utility knife. I then took just the loop sides (the fuzzy side) and laid them out on the Acrylic base to determine the spacing. I peeled off the backing and carefully stuck each strip to make black, horizontal stripes on the surface of the blue plastic.



Because I cut the Velcro in strips, I could run into a problem where the Velcro strips either don't come into contact at all with the piece I am trying to stick down, or come into full contact and make it very hard to remove the piece. My solution was to stick the Velcro hook sides to the breadboards and Arduino mounts on a diagonal. This way, I can rotate any of these pieces in 90° increments and still make contact with about half of the loop side of the Velcro.



To do this I measured the width of the strips, roughly 3/4", and measured down one side 3/4". I lined up my straight edge with the corner and my mark and cut a 45° angle that I then lines up with one edge of the part receiving Velcro.



I chose to put the hook side of the Velcro facing down on the bottom of the various pieces. This way they will stick to a couch or other piece of fabric, rather than sliding off and falling to the floor.