<human>: Give me the gist of the text in a nutshell

First off, bit of back story.  We used to live in a changing neighbourhood which had been stagnant for a few decades (Same people, etc). However, soon after we moved out, a few people sold their houses and left, including one cat aficionado. 

They had dozens of cats, but were able to rehome most of them. However there are a few feral cats which have sort of had the run of my yard. Not so bad except when I go there with my dogs (gated yard). As it is I won't let my children play in the yard till I hose things down. 

They (the cats) sort of got pushed to my lot, are fed by someone in my lot, so I can't blame the cats. However winter is coming (no, really). I wanted to set up some sort of cat shelter for them. Ergo I was wondering if anyone here had any experiences, or advice. Keep in mind, I need a set it/forget it type of solution as I only go there once a month or less. Although I'm handy, I don't have a lot of time. I looked at prebuilt options (Feral villa, etc) however they have a 30 day lead time (won't get here till we're well into winter).
<bot>: It's getting cold and I hope I could glean a bit of advice/warnings/lessons on outdoor cat shelters for feral cats.