Just to be clear, I don’t think the Lee is appreciably “thickeR” than the WCC once mounted or for hauling. But the Lee SW150 II barrel style adapters are in fact much deeper than the WCC thin plate-style adapters. The WCC adapters are very wide, like little frisbees, but they can be stacked and slipped into the pouch or a pocket of one’s backpack, or along the side of an ICU. The Lee barrel-style adapters, especially if one does not want to keep them mounted on the lens (as I don’t) are a real PITA. Just my perspective. YMMV.
Paul and others make some good points about the size/weight torque issues. I have used this and other rigs on my Rodie 32. Once mounted on a stationary tripod, and absent significant wind, I have neither seen nor felt any significant stress. The 32, even with the noted misalignment issue, is a solid chunk of metal and glass. It seems more than capable of handling the WCC. Ditto with the Rodie 40 (for which the WCC 150 is overkill). FWIW, when mounted on the XF, and the 40-80 and the 120, set for maximum vibration sensitivity, and with the entire WCC rig filed with large glass filters, on a windy day, the WCC never developed sufficient movement to delay any shots.