You have a skiff. But the picture is of three rows with two of the three empty. To be more useful, is this one row. If so... are you using all of the space already or is there HP left over? Varigates, Voltage Block, and Maths are big modules to place in a skiff. You will also want to examine the DEPTH of each module and make sure that they will fit into the skiff that you've selected. There are no industry standards on depth.