Yep, but I only do 3-4 birds at a time. Doesn't totally eliminate flies as garage doors are cracked open a bit, I set up fan to blow them away from gutting table. Not much mess, per se, as it is all contained in buckets and trays. I don't use running water during slaughter, just a couple of dunk buckets before icing in cooler, final rinse is done in kitchen before resting in fridge there. Buckets contents dumped in woods afterwards, then all cleaned in laundry sink. 2 car garage is under house, van is outside during summer so use one bay for projects, and close to water source. Cone bottom is set almost into bucket with a cardboard 'backsplash' and I hold head until dead to keep blood spatter contained. I get 140F water out of laundry sink close to water heater, propane burner keeps it at ~155F. Plucking done into 30 gal garbage can, feet held with spring clamps on board mounted above, feathers added to gut bucket before woods dump. Gutting done in large shallow tray(washing machine pan) set on table that has utility arm light clamped on and stool to sit on. Set up and clean up take 4x longer than the slaughtering, wish I could do more than 4 at a time but fridge, freezer and physical stamina capacity is limited. Wow, that got long. Sorry for hijack @byyounghusband.
