I have two now, but they are basically the same in construction. You can make them longer to take more rails too, or simply build another one when your collection grows!
The rails with the round bases are from Ikea, called Bygel, and retail for the astronomical price of $1.95 each! Rather than attach them directly to the wall, which means 4 holes per rail, my clever hubby decided to mount them on short lengths of pine timber , meaning only 4 holes in total. This also creates more depth between the wall behind and the rail for the large punches.
The rail with the white end caps is a piece of aluminium tubing from Bunnings Hardware, and this rail is attached to the timber with screw eyes. This rail is closer to the wall, so it's perfect for the small punches. The hooks are also from the Bygel range at Ikea, and are great for the ends of the rails to hold bits and pieces.
So, basically you only need to measure your biggest punch, and space the rails accordingly, screw them to the timber, then attach the timber to the wall with Wallmates or similar, to suit the type of your wall. Ta Da!