Well the only way you can truly know if he is a Het is to prove him out.
You should really look into getting a Helix. Well trusted and worth the money. Oh and when you start building your rack are you going to use Flex watt for heat? (You don't have to of course I am just curious)
Now the rack you are going to start building is that for your current babies or the beauts on the way?
I totally understand the excitement involved..In a couple of weeks I am going to start building my incubator.