Still using it! No major issues but my turner did break and I have never replaced it. I just turn them once a day by hand. I don't use any water except maybe in the winter when it gets really dry. It just requires some normal maintenance like tighten some bolts here and there. The flexwatt is still working fine. I have a light that adds some heat and I will change the wattage based on the temps to add more or less heat.
If I had to do it over I might add more insulation to hold temps better. Not a major issue by any means.
Thanks for the update! I can see that the turner is the trickiest part of this. Hopefully, using a Linear Actuator will remove some of the complications with gearing and such.
I assume you use a separate hatcher, did you build a large hatcher too?