We finally fully finished our shredder (it took us about a year :D). We used an 220V electric engine and an BEKVÄM kitchen cart from IKEA.
220V because…
…we want to be able to shred on every location where we can find a power plug. The machine is not SUPERSTRONG, but is able to shred most kinds of plastics with a little help.
Kitchen cart because…
… we don’t know how to weld. But, we had to make it stronger by using steel sections. So it’s a bit heavy now :P.
The wooden boxes are used for storage and to collect the flakes.
You guys did a great job. Now I have a few options to figure out how to do my shredder.
That shredder frame looks gorgeous, congratulations 
@elizabethpoll The motor seems to be 1 1/2HP which is not enough. My recommendation is to get either a 220v 3HP+ monophase motor, or a 2HP+ triphase motor.
Suuuuper nice shredder!
Always love to see existing products being used for the machines – makes it another bit easier for everyone to build them (as they can easily copy this trick) 
Good one with the kitchen cart, so now you have a mobile version on top!
Doesn’t it move a lot while shredding though?
I have no knowledge of motors and need help. Would this motor work for the shredder? It looks like it’s missing something. Please help.