That's going to be a pretty sweet incubator! It would probably be a good idea to add more fans though. If you don't, I think you are going to have a hard time keeping temps even on all the levels (some tubs will be too hot or too cold. I have a few incubators that need more air circulation and I'm thinking about using one of these:
AC Infinity AI-CFS120BA Single 120 Quiet Cabinet Fan Kit, for Home Theater AV Amplifier Media Cooling, Black

I like that it has the screen on it. I'm paranoid about a hatchling getting loose in there and ending up in the fan. Plus, it says you can wire up to four together.

Since your incubator is so big (you'll want multiple fans) you might want the bigger one:
AC Infinity AI-CFD120BA Dual 120 Quiet Cabinet Fan Kit, for Home Theater AV Amplifier Media Cooling, Black