With the ram midways down mine has about 1/8 of an inch of side to side movement, and yes you can see the shell plate move if you push it sideways hard enough but I've never thought about it because it never caused me an issue.
The frames are made out of an Aluminum alloy of some kind but I never considered them to be light.
The hopper on top of the case feeder lifts right off, it's not bolted on. You will need some ceiling height for that also. You should have about a foot of room above the top of the case feeder hopper to comfortably lift it off and to dump cases in it. When you change calibers you have to change the plastic tube to a larger tube, 40 S&W won't drop down the 9mm tube, and this is the only way to do it. The aluminum bushing on top of the plastic fits up into a recess under my left hand.
I find that convenient for dumping case cleaning media out it every so often and changing collator plates unless you 7' tall. It doesn't matter how well you clean you cases that stuff gets in there but it all goes down under the shell plate where it doesn't cause any trouble. It doesn't get into any mechanisms on it and doesn't come down the tube.
I use my case feeder for short cases like .380, 9mm,40S&W, 45ACP and so on, and it works really well for them. Anything with a heavy head to body weight ratio.
I've never tried .223 cases in it, I don't own one.
For cases like .357mag it runs a lot and gives little yield. I just turn the case feeder off with .357mags and drop them in the case funnel half ways down the feeder assy when it's open on the down stroke. It's really no different than setting them in front of the case pusher except I'm dropping them in a funneled hole instead of reaching into the press to set them down. This way I leave most of it set up for 9mm all the time.
Just a little less tedious.