Is this a good idea about an incubator?

It has problems. 1) It should have a small vent at the bottom and at the top to allow fresh air in. Opening the top twice a day to turn the eggs may not be enough. A setting hen will not seal out the fresh air. 2) An accurate thermometer helps hatch more chicks. 3) Proper humidity is critical to a successful hatch and has to be changed in the last three days for chicken eggs. A common problem is chicks stuck in the shell from incorrect humidity. 4) The eggs close to the bulb will be warmer than those far from the bulb and the design is not conducive to proper air circulation. Yes is is cheap but is it worth the constant attention and adjustments so as to not waste a dozen fertile eggs.