Pics of mini-bator I put together yesterday. Can accomodate 8-10 eggs, and will hatch in another. It's pretty small, but is very stable so far. Invested in a wafer thermostat, and we're still playing with a turner concept, using a tackle box tray...will drill holes through which a dowel rod connected to the box will allow turning from outside. Can you use poly-fil to push around the eggs, to keep them standing "up?" Wouldn't see why not. No floor yet. I mounted the fan on the inside pane of the window, and used spacers, thinking that would encourage better air flow. But, there's plenty of air movement, and now in this smaller space, the eggs will get a direct hit, and despite good temps and humidity, that may not be optimal. This bator is sitting on top of the first one we did, using a water heater therm. I put a dimmer on it, and have been able to help the temp swings. This is really satisfying, and fun. I like duct tape better than caulk, but caulk does look more professional. Don't let the wiring intimidate you. It's really very easy. Just be patient the first time or two, then the "light bulb will come on," (pun intended) and it'll go very quickly. Good drawings here to help you. I do have a surplus of fans and 12V converters on hand now, so if any one needs one, let me know.