We have a few that we use and we have built a few others.We usually build a front rack,if it doesn't already have one,and hang everything off of there.It is very simple,just two small pins holding plow to ATV frame,and a cable and pulley,with a manual lift arm mounted to the front rack.The moldboard is half of an old 55 Gal drum,with a full trip design,using some old garage door springs,and two eye bolts.Just don't go overboard on it or you will never lift it !!
We have also installed several factory plow setups which are very nice,just they don't lift high enough,so your forced to find a handicapped ramp,or back up the sidewalk,which will still bend the blade harness if your not careful.Most of these newer units have a small ATV winch to lift the blade,which is nice,but if you use it too much,the battery dies real quick,as they have very low output alternators,and small batteries.Add a winch,and a few lights,and they go dead real fast.
I would only recommend one if you have a lot of long straight sidewalks,which are done before you plow.Then you can dump the snow onto the lot.Otherwise a snowblower is actually better,as you can control where the snow goes,and even throw it ahead of you if you have no where to put it.