Finally did it...all but the hard mounting of the filters under the cabinet. I have to build something to hold the weight of this (1/4" paneling won't do it), and it's raining out here so the power tools aren't coming out.
...the filters in the sink are for my external unit...
We'll probably get one more use out of the rig before getting pickled for a long winter.
**Edit to bump the correct post - I edited the title and now that comes up first.