Don't feel bad, neither one of you. I tried to make a homemade bator and then gave up and went and bought one. But now after buying one that is a piece of crap, I'm now back to thinking of making my own again, lol!!!
The key to hatching in my opinion is all about the temp and not so much about turning, humidity, and etc. So yes a fan(s) will help with getting the temp more constant and uniform throughout the inside of the bator. The DIY plug in stuff should work fine as long as you elec tape it up good, I got a fan at BestBuy for around $8 and used and old cell phone charger that I didn't use or need to splice into it and it works great.
P.S. What does DH mean, I see it typed all the time, is it Dad/husband, dumb husband, douchebag husband?