We have one similar to above but with one belt and wheel. We built a guard around it for added safety. I don't think they are that unsafe unless you are truly careless. It will grind some serious meat though. I do like the tray you have I may have to build one for ours would work well for the second grind of meat. I will add a pic of ours once we break it out this winter.
However I did buy a grinder for my kitchenaid to do small batches. I did 10lbs of pork brats jalapeno popper and a philly cheesesteak. Then I grinded 30lbs of deer for a buddy in it. Well lets just say I am out a stand mixer now. The whole spindle came out and it has been an uphill battle with their customer service the entire way. Never again!