Our Homemade Incubator

Well, from what information Katrina and I could gather, (and what we could afford without our mother noticing) we have macgyvered our own homemade egg incubator. We have placed a small cardboard packing box inside of a bigger cardboard box. As you can we flipped the box on it's side and used it as a shelter to clamp the heating lamp on. The lamp is using a 100 watt bulb and it has a dimmer installed.
In the smaller packing box, we've placed heat resistant plastic wrap over 2 halves of the box. there are air holes in the plastic wrap to allow air flow. We decide to cover both halves of the box with the plastic wrap to keep the humidity at a constant high level. We also didn't want the water vapors to shatter the light bulb.
For humidity we have added 2 damp wash cloths. We also added a thermometer and hydrometer to the smaller box to keep track of our levels. Temp is around 98-99 degrees fahrenheit and humidity levels are around 50. We've worked out a schedule and have been turning the egg 5 times a day. An odd number so the egg isn't resting on one side all night every night. This all I know to do at this point in the process. Any advice would be helpful.