Ah, no it's not like that an 'automatic incubator turns the eggs. A manual incubator does everything else except turns the eggs. Or, at least, it does the temperature. Get a manual incubator I have 8 chicks here on each side of the desk I'm typing at which hatched from a manual incubator. There is practically nothing that needs doing with them, all you do is tilt the eggs to the opposite direction before you sleep and after you wake and at any random time you like during the day. It's not rocket science, it's just random really. I've done it heaps. Sometimes if you think it is a very dry day you can pour a little water into the bottom of the incubator, but otherwise I just don't put water in at all.
The most important thing about making an incubator in an old fridge is to be able to 'plan' your chicken empire which will take over the world. DON'T LET YOUR HANDYMAN FOIL YOUR EVIL PLANS. Get help from some other evil handyman, or threaten to, in order to bend him to your will. Sure you won't hatch 500 eggs at a time but who cares, it's so that you just know that you could take over the world at a whim if you cared to. Also, if you fill those empty spaces with bottles of water, the incubator can ignore blackouts a whole lot better than any other kind or model of incubator, full stop.