is it possible to use a motor and metal to do suction of the foam discs or nah?
To put it simply, nah. It’s not worth it.
You can definitely make a suction mechanism, but it’s too much effort when there are other methods like a rolling intake.
BUT it would be really cool!1!1!!
I would love to see someone try designing a system that uses suction. The game manual only prevents you from pressurizing more than 100 psi nothing about creating a vacuum. And for the rules about using tubing to store extra air? Nothing about the absence of air. So go ahead have fun and try to make something cool. Don’t expect it to work well but maybe try to get something to work.