Mine are similar, but with a bit more space around them. I put spacers on the sides and a stop across the back, to keep the systainers in place, attached with 23ga pins. Then I put a taller wall in the back to prevent the "extras" that I store behind them. I have boxes of abrasives behind the sanders, the angle attachment behind the OF1010, a ziplock bag of 6mm Dominos behind the DF500, etc.