Consider using a bottle jack in place of the scissor jacks. You will need a spring to return the ram after pressing the can. Google bottle jack press and you will get lots of ideas.

If you have the means to build a frame, and have a truck junk yard in the neighborhood, pick up a type 30 air brake chamber, and power it with tap water.

The type 30 means that the diaphragm has 30 square inches of area, and with 30 PSI at the faucet, you'll generate 900 pounds of crush.

You can make a neato electric control valve by stripping the water solenoids out of an automatic washing machine. You will need two snap switches (like for a wall box to turn on your dining room light) Put one solenoid valve in the supply line to fill the brake chamber, and tee the other one to drain water out of the chamber.

If you're crazy enough to tackle this thing, I'm enough of an enabler to give you a specific plumbing and electrical schematic diagram. Just email me with the request.