I did something similar.
From the ground up: Pot > Strainer > Mould > Dish > Tupperware Spacer > Ale Pale. It was perfect height on my counter to have the lip of the Ale Pale right around the height of the round knob of the cabinet. If I pressed down extra hard and squeezed it down good, I could get the lip of the bucket behind the knob and used the knob to keep things in place. It was a tight fit, perfect for keeping things upright - until you need something in that cabinet.
I made the mistake of using a bowl under the piston and got a concave piece of cheese that ended up spewing some up and over the side of the mould creating some sort of murshoomy shape. I ended up cutting more than 50% off to get a good round piece to wax. :/
Next time, lessons will be learned.