It looks like everybody is making these things at home, even though you can buy a new Chinese reflow oven on Ebay for less than three hundred dollars. It looks like a good one… all ready to go. But then, I would not have the challenge of making one of my own design.
I have never done reflow before but I have soldered smd’s to circuit boards with pretty good success. I also have access to a hot air rework system with an assortment of nozzles where I work. It never was that hard. I just takes some care not to short out pads or get things too hot.