All you need is a sharp knife, a canning kettle, an old work table, and plastic bags for the feathers and innards. I'm not real fast at it, but once I start the processing step it's only 15 minutes or so until they are ready to chill. No blood in the house, and a bird raised on a good diet, withdrawn from feed at least 14 hours before processing, and hosed off after bleeding out makes almost no mess that can't be bagged.
No need to do them all at once, I prefer not to do more than 5 at a sitting unless I have help to make it a production line.
It is illegal for me to sell birds that I have processed here in Ontario, they must have the stamp of an approved provincial inspector.
Build stackable brooders.
Yeah, that isn't going to be too much of a problem actually. I used a light box I had built for germinating and growing transplants to make the brooder I have, and I already have 2 more light boxes. The biggest problem is going to be getting enough heat into them in that first week or so. I took the heat lamp out from the 3 stooges when they were like 9 days old, and they were fine. With so many chicks in each brooder, I have to wonder if they will need any heat lamp at all.